Permanent namespace corruption after attempting to delete a namespace shortly after it was created and after all contained topics were deleted; broker log of "MetadataNotFoundException: Managed ledger not found"

**Describe the bug**
If I create a namespace, put a persistent, partitioned topic in it, and then immediately thereafter delete the topic and attempt to delete the namespace, namespace deletion sometimes fails with a 500 error that corresponds to "MetadataNotFoundException: Managed ledger not found" in the broker's log.

**Note that this error condition is persistent; if it occurs once it keeps occurring; the namespace can never be deleted**.

Note that I was connecting to this broker through a Pulsar proxy; my client is programmed to raise an exception on 307 redirect codes, so the 307 response served by the broker in the log snippet below must have been handled by the proxy, not my client.

**To Reproduce**
Run reproduction plan for https://github.com/apache/pulsar/issues/12551; sometimes no error will occur, sometimes the error described in that issue or others will occur, and sometimes this error will occur.

**Expected behavior**
1. Namespace deletion should succeed.
2. This is probably more important: all operations related to deletion/creation of topics/namespaces/tenants/subscriptions conclude *before* the management API returns success codes to the user. This bug and the other similar ones I filed (see github links below) all seem to arise from CRUD operations with the management API being asynchronous: i.e. when I create/delete a tenant/topic/namespace, the actual side effects of that creation or deletion (e.g. adding/removing ledgers in BookKeeper, updating metadata in ZK) occur later, not during the API post. Not only is that bound to cause bugs like this, but it's also not what users expect; I would be happy to wait seconds or minutes for management API operations to complete in exchange for knowing that when they successfully complete that the thing I requested has actually been done.

**Environment**
Same environment as https://github.com/apache/pulsar/issues/12551

**What my client sees**

```
chariot.pulsar.client.exceptions.PulsarAPIError: Server error '500 Server Error' for url 'http://pulsar-blt-sn-platform-proxy-headless.pulsar:8080/admin/v2/persistent/blt4/chariot_ns_test/chariot_topic_test/partitions?force=true'
Response code: 500
URL: DELETE http://pulsar-blt-sn-platform-proxy-headless.pulsar:8080/admin/v2/persistent/blt4/chariot_ns_test/chariot_topic_test/partitions?force=true
Headers: Headers({'host': 'pulsar-blt-sn-platform-proxy-headless.pulsar:8080', 'accept': '*/*', 'accept-encoding': 'gzip, deflate', 'connection': 'keep-alive', 'user-agent': 'python-httpx/0.20.0'})
Payload: b''
```

**Broker Stacktrace**

```
[31/Oct/2021:16:23:15 +0000] "GET /admin/v2/persistent/blt4/chariot_ns_test HTTP/1.1" 200 68 "-" "python-httpx/0.20.0" 2
[31/Oct/2021:16:23:15 +0000] "DELETE /admin/v2/persistent/blt4/chariot_ns_test/chariot_topic_test?force=true HTTP/1.1" 307 0 "-" "python-httpx/0.20.0" 0
broker-0 16:23:15.813 [pulsar-web-41-5] INFO org.apache.pulsar.broker.admin.impl.PersistentTopicsBase - [null] Topic was already not existing persistent://blt4/chariot_ns_test/chariot_topic_test
java.util.concurrent.ExecutionException: org.apache.bookkeeper.mledger.ManagedLedgerException$MetadataNotFoundException: Managed ledger not found
at java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:395) ~[?:?]
at java.util.concurrent.CompletableFuture.get(CompletableFuture.java:1999) ~[?:?]
at org.apache.pulsar.broker.admin.impl.PersistentTopicsBase.internalDeleteTopicForcefully(PersistentTopicsBase.java:304) ~[io.streamnative-pulsar-broker-2.8.1.5.jar:2.8.1.5]
at org.apache.pulsar.broker.admin.impl.PersistentTopicsBase.internalDeleteTopic(PersistentTopicsBase.java:946) ~[io.streamnative-pulsar-broker-2.8.1.5.jar:2.8.1.5]
at org.apache.pulsar.broker.admin.v2.PersistentTopics.deleteTopic(PersistentTopics.java:889) ~[io.streamnative-pulsar-broker-2.8.1.5.jar:2.8.1.5]
at jdk.internal.reflect.GeneratedMethodAccessor459.invoke(Unknown Source) ~[?:?]
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
at java.lang.reflect.Method.invoke(Method.java:566) ~[?:?]
at org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory.lambda$static$0(ResourceMethodInvocationHandlerFactory.java:52) ~[org.glassfish.jersey.core-jersey-server-2.34.jar:?]
at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:124) ~[org.glassfish.jersey.core-jersey-server-2.34.jar:?]
at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:167) ~[org.glassfish.jersey.core-jersey-server-2.34.jar:?]
at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$VoidOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:159) ~[org.glassfish.jersey.core-jersey-server-2.34.ja
at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:79) ~[org.glassfish.jersey.core-jersey-server-2.34.jar:?]
at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:475) ~[org.glassfish.jersey.core-jersey-server-2.34.jar:?]
at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:397) ~[org.glassfish.jersey.core-jersey-server-2.34.jar:?]
at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:81) ~[org.glassfish.jersey.core-jersey-server-2.34.jar:?]
at org.glassfish.jersey.server.ServerRuntime$1.run(ServerRuntime.java:255) ~[org.glassfish.jersey.core-jersey-server-2.34.jar:?]
at org.glassfish.jersey.internal.Errors$1.call(Errors.java:248) ~[org.glassfish.jersey.core-jersey-common-2.34.jar:?]
at org.glassfish.jersey.internal.Errors$1.call(Errors.java:244) ~[org.glassfish.jersey.core-jersey-common-2.34.jar:?]
at org.glassfish.jersey.internal.Errors.process(Errors.java:292) ~[org.glassfish.jersey.core-jersey-common-2.34.jar:?]
at org.glassfish.jersey.internal.Errors.process(Errors.java:274) ~[org.glassfish.jersey.core-jersey-common-2.34.jar:?]
at org.glassfish.jersey.internal.Errors.process(Errors.java:244) ~[org.glassfish.jersey.core-jersey-common-2.34.jar:?]
at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:265) ~[org.glassfish.jersey.core-jersey-common-2.34.jar:?]
at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:234) ~[org.glassfish.jersey.core-jersey-server-2.34.jar:?]
at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:680) ~[org.glassfish.jersey.core-jersey-server-2.34.jar:?]
at org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:394) ~[org.glassfish.jersey.containers-jersey-container-servlet-core-2.34.jar:?]
at org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:346) ~[org.glassfish.jersey.containers-jersey-container-servlet-core-2.34.jar:?]
at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:366) ~[org.glassfish.jersey.containers-jersey-container-servlet-core-2.34.jar:?]
at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:319) ~[org.glassfish.jersey.containers-jersey-container-servlet-core-2.34.jar:?]
at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:205) ~[org.glassfish.jersey.containers-jersey-container-servlet-core-2.34.jar:?]
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:799) ~[org.eclipse.jetty-jetty-servlet-9.4.43.v20210629.jar:9.4.43.v20210629]
at org.eclipse.jetty.servlet.ServletHandler$ChainEnd.doFilter(ServletHandler.java:1626) ~[org.eclipse.jetty-jetty-servlet-9.4.43.v20210629.jar:9.4.43.v20210629]
at org.apache.pulsar.broker.web.ResponseHandlerFilter.doFilter(ResponseHandlerFilter.java:67) ~[io.streamnative-pulsar-broker-2.8.1.5.jar:2.8.1.5]
at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:193) ~[org.eclipse.jetty-jetty-servlet-9.4.43.v20210629.jar:9.4.43.v20210629]
at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1601) ~[org.eclipse.jetty-jetty-servlet-9.4.43.v20210629.jar:9.4.43.v20210629]
at org.apache.pulsar.broker.intercept.BrokerInterceptor.onFilter(BrokerInterceptor.java:88) ~[io.streamnative-pulsar-broker-2.8.1.5.jar:2.8.1.5]
at org.apache.pulsar.broker.web.ProcessHandlerFilter.doFilter(ProcessHandlerFilter.java:49) ~[io.streamnative-pulsar-broker-2.8.1.5.jar:2.8.1.5]
at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:193) ~[org.eclipse.jetty-jetty-servlet-9.4.43.v20210629.jar:9.4.43.v20210629]
at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1601) ~[org.eclipse.jetty-jetty-servlet-9.4.43.v20210629.jar:9.4.43.v20210629]
at org.apache.pulsar.broker.web.PreInterceptFilter.doFilter(PreInterceptFilter.java:70) ~[io.streamnative-pulsar-broker-2.8.1.5.jar:2.8.1.5]
at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:193) ~[org.eclipse.jetty-jetty-servlet-9.4.43.v20210629.jar:9.4.43.v20210629]
at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1601) ~[org.eclipse.jetty-jetty-servlet-9.4.43.v20210629.jar:9.4.43.v20210629]
at org.apache.pulsar.broker.web.PreInterceptFilter.doFilter(PreInterceptFilter.java:70) ~[io.streamnative-pulsar-broker-2.8.1.5.jar:2.8.1.5]
at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:193) ~[org.eclipse.jetty-jetty-servlet-9.4.43.v20210629.jar:9.4.43.v20210629]
at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1601) ~[org.eclipse.jetty-jetty-servlet-9.4.43.v20210629.jar:9.4.43.v20210629]
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:548) ~[org.eclipse.jetty-jetty-servlet-9.4.43.v20210629.jar:9.4.43.v20210629]
at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233) ~[org.eclipse.jetty-jetty-server-9.4.43.v20210629.jar:9.4.43.v20210629]
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1624) ~[org.eclipse.jetty-jetty-server-9.4.43.v20210629.jar:9.4.43.v20210629]
at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233) ~[org.eclipse.jetty-jetty-server-9.4.43.v20210629.jar:9.4.43.v20210629]
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1434) ~[org.eclipse.jetty-jetty-server-9.4.43.v20210629.jar:9.4.43.v20210629]
at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:188) ~[org.eclipse.jetty-jetty-server-9.4.43.v20210629.jar:9.4.43.v20210629]
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:501) ~[org.eclipse.jetty-jetty-servlet-9.4.43.v20210629.jar:9.4.43.v20210629]
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1594) ~[org.eclipse.jetty-jetty-server-9.4.43.v20210629.jar:9.4.43.v20210629]
at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:186) ~[org.eclipse.jetty-jetty-server-9.4.43.v20210629.jar:9.4.43.v20210629]
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1349) ~[org.eclipse.jetty-jetty-server-9.4.43.v20210629.jar:9.4.43.v20210629]
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141) ~[org.eclipse.jetty-jetty-server-9.4.43.v20210629.jar:9.4.43.v20210629]
at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:234) ~[org.eclipse.jetty-jetty-server-9.4.43.v20210629.jar:9.4.43.v20210629]
at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:146) ~[org.eclipse.jetty-jetty-server-9.4.43.v20210629.jar:9.4.43.v20210629]
at org.eclipse.jetty.server.handler.StatisticsHandler.handle(StatisticsHandler.java:179) ~[org.eclipse.jetty-jetty-server-9.4.43.v20210629.jar:9.4.43.v20210629]
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127) ~[org.eclipse.jetty-jetty-server-9.4.43.v20210629.jar:9.4.43.v20210629]
at org.eclipse.jetty.server.Server.handle(Server.java:516) ~[org.eclipse.jetty-jetty-server-9.4.43.v20210629.jar:9.4.43.v20210629]
at org.eclipse.jetty.server.HttpChannel.lambda$handle$1(HttpChannel.java:388) ~[org.eclipse.jetty-jetty-server-9.4.43.v20210629.jar:9.4.43.v20210629]
at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:633) [org.eclipse.jetty-jetty-server-9.4.43.v20210629.jar:9.4.43.v20210629]
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:380) [org.eclipse.jetty-jetty-server-9.4.43.v20210629.jar:9.4.43.v20210629]
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:277) [org.eclipse.jetty-jetty-server-9.4.43.v20210629.jar:9.4.43.v20210629]
at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:311) [org.eclipse.jetty-jetty-io-9.4.43.v20210629.jar:9.4.43.v20210629]
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:105) [org.eclipse.jetty-jetty-io-9.4.43.v20210629.jar:9.4.43.v20210629]
at org.eclipse.jetty.io.ChannelEndPoint$1.run(ChannelEndPoint.java:104) [org.eclipse.jetty-jetty-io-9.4.43.v20210629.jar:9.4.43.v20210629]
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:338) [org.eclipse.jetty-jetty-util-9.4.43.v20210629.jar:9.4.43.v20210629]
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:315) [org.eclipse.jetty-jetty-util-9.4.43.v20210629.jar:9.4.43.v20210629]
broker-1 16:23:15.820 [pulsar-web-41-4] INFO org.eclipse.jetty.server.RequestLog - 10.0.234.253 - - [31/Oct/2021:16:23:15 +0000] "DELETE /admin/v2/namespaces/blt4/chariot_ns_test HTTP/1.1" 409 46 "-" "python-httpx/0.2
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:173) [org.eclipse.jetty-jetty-util-9.4.43.v20210629.jar:9.4.43.v20210629]
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:131) [org.eclipse.jetty-jetty-util-9.4.43.v20210629.jar:9.4.43.v20210629]
at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:386) [org.eclipse.jetty-jetty-util-9.4.43.v20210629.jar:9.4.43.v20210629]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) [?:?]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) [?:?]
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) [io.netty-netty-common-4.1.68.Final.jar:4.1.68.Final]
at java.lang.Thread.run(Thread.java:829) [?:?]
Caused by: org.apache.bookkeeper.mledger.ManagedLedgerException$MetadataNotFoundException: Managed ledger not found
[31/Oct/2021:16:23:15 +0000] "DELETE /admin/v2/persistent/blt4/chariot_ns_test/chariot_topic_test?authoritative=true&force=true HTTP/1.1" 204 0 "-" "Jetty/9.4.43.v20210629"
```

Reproduce the plan referenced in issue 12551, then trace the DELETE management API through PersistentTopicsBase.internalDeleteTopicForcefully and internalDeleteTopic, the stack-trace entry points. Determine why a missing managed ledger leaves namespace deletion permanently broken; done means the reported sequence returns success and the namespace can be deleted afterward.

Written by the indexing model from the issue text.