Review Disabled tests in `core`

**Jetty version(s)**
12.1.x

**Jetty Environment**
core

Review the following test classes that have at least one `@Disabled` test. Acceptable resolutions are:

* reinstate test (remove `@Disabled`)
* delete test
* add comment to `@Disabled` and add any `@EnabledOn`, `@DisabledOn` as necessary to circumscribe test

- [x] jetty-http/src/test/java/org/eclipse/jetty/http/MultiPartFormDataTest.java
- [x] jetty-http/src/test/java/org/eclipse/jetty/http/MultiPartTest.java
- [ ] jetty-http2/jetty-http2-tests/src/test/java/org/eclipse/jetty/http2/tests/AsyncServletTest.java
- [ ] jetty-http2/jetty-http2-tests/src/test/java/org/eclipse/jetty/http2/tests/MaxConcurrentStreamsTest.java
- [ ] jetty-http2/jetty-http2-tests/src/test/java/org/eclipse/jetty/http2/tests/ConcurrentStreamCreationTest.java
- [ ] jetty-http2/jetty-http2-tests/src/test/java/org/eclipse/jetty/http2/tests/AsyncIOTest.java
- [x] jetty-client/src/test/java/org/eclipse/jetty/client/HttpClientTLSTest.java
- [x] jetty-server/src/test/java/org/eclipse/jetty/server/ShutdownMonitorTest.java
- [x] jetty-server/src/test/java/org/eclipse/jetty/server/ssl/SniSslConnectionFactoryTest.java
- [x] jetty-server/src/test/java/org/eclipse/jetty/server/PartialRFC2616Test.java
- [x] jetty-server/src/test/java/org/eclipse/jetty/server/NotAcceptingTest.java
- [x] jetty-server/src/test/java/org/eclipse/jetty/server/HttpConnectionTest.java
- [x] jetty-server/src/test/java/org/eclipse/jetty/server/HttpChannelEventTest.java
- [x] jetty-server/src/test/java/org/eclipse/jetty/server/handler/QoSHandlerTest.java
- [x] jetty-server/src/test/java/org/eclipse/jetty/server/handler/NcsaRequestLogTest.java
- [x] jetty-server/src/test/java/org/eclipse/jetty/server/handler/SecuredRedirectHandlerCodeTest.java
- [x] jetty-server/src/test/java/org/eclipse/jetty/server/handler/ContextHandlerGetResourceTest.java
- [x] jetty-server/src/test/java/org/eclipse/jetty/server/handler/ResourceHandlerTest.java
- [x] jetty-server/src/test/java/org/eclipse/jetty/server/handler/ContextHandlerTest.java
- [x] jetty-server/src/test/java/org/eclipse/jetty/server/handler/DebugHandlerTest.java
- [x] jetty-server/src/test/java/org/eclipse/jetty/server/handler/ResourceHandlerByteRangesTest.java
- [x] jetty-server/src/test/java/org/eclipse/jetty/server/handler/AllowSymLinkAliasCheckerTest.java
- [x] jetty-server/src/test/java/org/eclipse/jetty/server/ServerConnectorTest.java
- [x] jetty-server/src/test/java/org/eclipse/jetty/server/ThreadStarvationTest.java
- [x] jetty-server/src/test/java/org/eclipse/jetty/server/LowResourcesMonitorTest.java
- [ ] jetty-quic/jetty-quic-server/src/test/java/org/eclipse/jetty/quic/server/QuicServerConnectorTest.java
- [x] jetty-util/src/test/java/org/eclipse/jetty/util/resource/MountedPathResourceTest.java
- [x] jetty-util/src/test/java/org/eclipse/jetty/util/resource/ResourceFactoryTest.java
- [ ] jetty-util/src/test/java/org/eclipse/jetty/util/resource/ResourceTest.java
- [x] jetty-util/src/test/java/org/eclipse/jetty/util/ssl/SslContextFactoryTest.java
- [ ] jetty-util/src/test/java/org/eclipse/jetty/util/thread/VirtualThreadPoolTest.java
- [ ] jetty-security/src/test/java/org/eclipse/jetty/security/SPNEGOAuthenticatorTest.java
- [x] jetty-fcgi/jetty-fcgi-server/src/test/java/org/eclipse/jetty/fcgi/server/ExternalFastCGIServerTest.java
- [x] jetty-websocket/jetty-websocket-core-tests/src/test/java/org/eclipse/jetty/websocket/core/autobahn/AutobahnTests.java
- [ ] jetty-tests/jetty-test-client-transports/src/test/java/org/eclipse/jetty/test/client/transport/VirtualThreadsTest.java
- [ ] jetty-http3/jetty-http3-tests/src/test/java/org/eclipse/jetty/http3/tests/HandlerClientServerTest.java
- [x] jetty-http3/jetty-http3-qpack/src/test/java/org/eclipse/jetty/http3/qpack/EncodeDecodeTest.java
- [x] jetty-alpn/jetty-alpn-conscrypt-client/src/test/java/org/eclipse/jetty/alpn/java/client/ConscryptHTTP2ClientTest.java
- [x] jetty-alpn/jetty-alpn-conscrypt-server/src/test/java/org/eclipse/jetty/alpn/conscrypt/server/ConscryptHTTP2ServerTest.java