[Bug] Enabling the AuthenticationTls using Keystore crasing with IllegalArgumentException

### Search before asking

- [X] I searched in the [issues](https://github.com/apache/pulsar/issues) and found nothing similar.

### Version

Client(2.11.0)-->proxy(2.11.0)-->broker(2.11.0)-->bookie(2.11.0)-->ZK(2.11.0)
OS: 159~16.04.1-Ubuntu

### Minimal reproduce step

**Step-1: Apply the TLS configuration using JKS keystore but enable the authentication between proxy and broker**
Proxy:
Enable TLS using JKS keystore
Apply this config to enable TLS: https://pulsar.apache.org/docs/2.11.x/security-tls-transport/#configure-proxies-1
Apply this config in proxy for authentication using keystore:
"brokerClientAuthenticationPlugin": "org.apache.pulsar.client.impl.auth.AuthenticationTls"
"brokerClientAuthenticationParameters": "{\"keyStoreType\":\"JKS\",\"keyStorePath\":\"/var/private/tls/client.keystore.jks\",\"keyStorePassword\":\"clientpw\"}"

Broker:
Enable TLS & Authentication using JKS keystore
https://pulsar.apache.org/docs/2.11.x/security-tls-authentication/#configure-brokers

**Step-2: Start the proxy and observe the below error logs**
Even though I configured to enable the AuthenticationTls only using keystore but it expecting the PEM configuration (tlsCertificateFilePath & tlsKeyFilePath)

The line where it expects the PEM configs:
https://github.com/apache/pulsar/blob/v2.11.0/pulsar-client/src/main/java/org/apache/pulsar/client/impl/auth/AuthenticationTls.java#L82

```
2023-02-11T01:19:53,880+0000 [main] INFO org.eclipse.jetty.server.session - node0 Scavenging every 600000ms
2023-02-11T01:19:53,900+0000 [main] INFO org.eclipse.jetty.server.handler.ContextHandler - Started o.e.j.s.ServletContextHandler@5f0f9947{/metrics,null,AVAILABLE}
2023-02-11T01:19:54,401+0000 [main] INFO org.eclipse.jetty.server.handler.ContextHandler - Started o.e.j.s.ServletContextHandler@c3edf4c{/,null,AVAILABLE}
2023-02-11T01:19:54,523+0000 [main] INFO org.eclipse.jetty.server.handler.ContextHandler - Started o.e.j.s.ServletContextHandler@1aad0b1{/proxy-stats,null,AVAILABLE}
2023-02-11T01:19:54,525+0000 [main] ERROR org.apache.pulsar.proxy.server.AdminProxyHandler - new jetty http client exception
java.lang.IllegalArgumentException: cert/key file path or cert/key stream must be present
at org.apache.pulsar.client.impl.auth.AuthenticationTls.getAuthData(AuthenticationTls.java:90) ~[org.apache.pulsar-pulsar-client-original-2.11.0.jar:2.11.0]
at org.apache.pulsar.proxy.server.AdminProxyHandler.newHttpClient(AdminProxyHandler.java:269) ~[org.apache.pulsar-pulsar-proxy-2.11.0.jar:2.11.0]
at org.apache.pulsar.proxy.server.AdminProxyHandler.createHttpClient(AdminProxyHandler.java:104) ~[org.apache.pulsar-pulsar-proxy-2.11.0.jar:2.11.0]
at org.eclipse.jetty.proxy.AbstractProxyServlet.init(AbstractProxyServlet.java:133) ~[org.eclipse.jetty-jetty-proxy-9.4.48.v20220622.jar:9.4.48.v20220622]
at javax.servlet.GenericServlet.init(GenericServlet.java:244) ~[javax.servlet-javax.servlet-api-3.1.0.jar:3.1.0]
at org.eclipse.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:632) ~[org.eclipse.jetty-jetty-servlet-9.4.48.v20220622.jar:9.4.48.v20220622]
at org.eclipse.jetty.servlet.ServletHolder.initialize(ServletHolder.java:415) ~[org.eclipse.jetty-jetty-servlet-9.4.48.v20220622.jar:9.4.48.v20220622]
at org.eclipse.jetty.servlet.ServletHandler.lambda$initialize$0(ServletHandler.java:750) ~[org.eclipse.jetty-jetty-servlet-9.4.48.v20220622.jar:9.4.48.v20220622]
at java.util.stream.SortedOps$SizedRefSortingSink.end(SortedOps.java:357) ~[?:?]
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:510) ~[?:?]
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499) ~[?:?]
at java.util.stream.StreamSpliterators$WrappingSpliterator.forEachRemaining(StreamSpliterators.java:310) ~[?:?]

```

### What did you expect to see?

I am trying to enable the TLS and with Authentication between proxy and broker uisng keystore.

Enabling Authentication in a proxy using Keystore configuration should not expect the PEM cert and keyfile path configuration

### What did you see instead?

Since i can use only keystore JKS, I am not able to enable the Authentication due to the above issue and even I disable the authentication it is failing due to another bug "https://github.com/apache/pulsar/issues/19480".

Now i am completely blocked!!! :-(

### Anything else?

_No response_

### Are you willing to submit a PR?

- [ ] I'm willing to submit a PR!