Unreported flaky test detected

If the flaky tests below are affected by the changes, please review and update the changes accordingly. Otherwise, a maintainer should report the flaky tests prior to merging the PR.

org.keycloak.testsuite.cluster.RealmInvalidationClusterTest#crudWithFailover

Keycloak CI - Store IT (postgres)

java.lang.RuntimeException: java.lang.IllegalStateException: Keycloak unexpectedly died :(
	at org.keycloak.testsuite.arquillian.containers.KeycloakQuarkusServerDeployableContainer.start(KeycloakQuarkusServerDeployableContainer.java:71)
	at org.jboss.arquillian.container.impl.ContainerImpl.start(ContainerImpl.java:185)
	at org.jboss.arquillian.container.impl.client.container.ContainerLifecycleController$8.perform(ContainerLifecycleController.java:137)
	at org.jboss.arquillian.container.impl.client.container.ContainerLifecycleController$8.perform(ContainerLifecycleController.java:133)
...

Report flaky test

Summary

• Most suitable approach on how to address this for now (easy to maintain)
• Verified by @bohmber it works for their deployment. See Liquibase update failed from KC 26.1 to KC 26.2 with PostgreSQL JDBC driver 42.7.5 #39917 (comment)
• Approved by @filipelautert (thanks!) - developer/maintainer of Liquibase
• Difficult to write some additional tests, but as it's externally verified and all other stuff works, we should be fine
• Follow-up task to remove the workaround once we have the new Liquibase version: Remove workaround for PostgreSQL and Liquibase #40687

@vmuzikar @shawkins Could you please check it? Thanks!