Before reporting an issue

[x] I have read and understood the above terms for submitting issues, and I understand that my issue may be closed without action if I do not follow them.

Area

infinispan

Describe the bug

Encountered a NullPointerException while performing configuration validation after upgrading to the latest version.

After upgrading Keycloak to 24.0.2, an error occurred while deleting ClientScopes with multiple replicas of Keycloak.
However, the deletion was successfully completed with only one replica(pod).

This wasn't happening with Keycloak 23.0.4.

```
2024-04-15 09:22:19,434 ERROR [org.keycloak.services.error.KeycloakErrorHandler] (executor-thread-3) Uncaught server error: java.lang.NullPointerException
at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1707)
at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:921)
at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:682)
at org.keycloak.models.cache.infinispan.RealmCacheSession.getClientScopesStream(RealmCacheSession.java:1353)
at org.keycloak.models.cache.infinispan.RealmAdapter.getClientScopesStream(RealmAdapter.java:1486)
at org.keycloak.services.resources.admin.ClientScopeResource.deleteClientScope(ClientScopeResource.java:154)
at org.keycloak.services.resources.admin.ClientScopeResource$quarkusrestinvoker$deleteClientScope_b6021911236efd787af232d356a308f338ee6a34.invoke(Unknown Source)
at org.jboss.resteasy.reactive.server.handlers.InvocationHandler.handle(InvocationHandler.java:29)
at io.quarkus.resteasy.reactive.server.runtime.QuarkusResteasyReactiveRequestContext.invokeHandler(QuarkusResteasyReactiveRequestContext.java:141)
at org.jboss.resteasy.reactive.common.core.AbstractResteasyReactiveContext.run(AbstractResteasyReactiveContext.java:147)
at io.quarkus.vertx.core.runtime.VertxCoreRecorder$14.runWith(VertxCoreRecorder.java:582)
at org.jboss.threads.EnhancedQueueExecutor$Task.run(EnhancedQueueExecutor.java:2513)
at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1538)
at org.jboss.threads.DelegatingRunnable.run(DelegatingRunnable.java:29)
at org.jboss.threads.ThreadLocalResettingRunnable.run(ThreadLocalResettingRunnable.java:29)
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.base/java.lang.Thread.run(Thread.java:840)
```

Version

24.0.2

Regression

[ ] The issue is a regression

Expected behavior

ClientScope deletion works with more than one replica

Actual behavior

NullPointerException occurred when using multiple replicas

How to Reproduce?

This problem will occur when Keycloak version is upgraded from 23.0.4 to 24.0.2 and the number of keycloak replica is set to two or more.

Anything else?

No response