OKE Workload Provider from Service Registry fails when Instance Metadata Service does not exist

[klustria]

Issue Description:

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There are scenarios where in a Kubernetes pod, the Instance Metadata Service (IMDS) does not exist. Because of this OKE Workload Provider will fail if FederationEndpoint is not set. The problem is, currently we don't have a way to pass in FederationEndpoint to the instantiation of OKE Workload Provider.

Environment Details:

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Helidon MP : v4.1.x
JDK : 21

Information

The issue is manifested with this log:

2025-01-22 17:26:30.184  [main] WARN  c.o.b.a.AbstractFederationClientAuthenticationDetailsProviderBuilder - Attempt 1 - Rest call to get region from metadata service failed 
jakarta.ws.rs.ProcessingException: org.apache.http.conn.ConnectTimeoutException: Connect to 169.254.169.254:80 [/169.254.169.254] failed: Connection timed out
	at org.glassfish.jersey.apache.connector.ApacheConnector.apply(ApacheConnector.java:533)
	at org.glassfish.jersey.apache.connector.ApacheConnector.apply(ApacheConnector.java:540)
	at org.glassfish.jersey.client.ClientRuntime.lambda$createRunnableForAsyncProcessing$6(ClientRuntime.java:185)
	at org.glassfish.jersey.internal.Errors$1.call(Errors.java:248)
	at org.glassfish.jersey.internal.Errors$1.call(Errors.java:244)
...
...
2025-01-22 17:28:43.375  [main] INFO  c.o.b.a.AbstractFederationClientAuthenticationDetailsProviderBuilder - Exiting retry 2 with wait time: 2117 millis
2025-01-22 17:29:35.996  [SIGTERM handler] DEBUG java.lang.Runtime - Runtime.exit() called with status: 143
java.lang.Throwable: Runtime.exit(143)
	at java.base/java.lang.Shutdown.logRuntimeExit(Shutdown.java:179)
	at java.base/java.lang.Shutdown.exit(Shutdown.java:160)
	at java.base/java.lang.Terminator$1.handle(Terminator.java:51)
	at java.base/jdk.internal.misc.Signal$1.run(Signal.java:218)
	at java.base/java.lang.Thread.run(Thread.java:1583)
2025-01-22 17:29:35.997  [helidon-shutdown-thread] INFO  io.helidon.Main - Shutdown requested by JVM shutting down
2025-01-22 17:29:35.997  [helidon-shutdown-thread] INFO  io.helidon.Main - Shutdown finished

It looks like when federation endpoint is not set and the oke workload provider instantiation mechanism was trying to get the region from the OCI Java SDK APIs and using it to construct the federation endpoint URL. If IMDS does not exist, the above failure will happen.