[CI] o.o.blocks.SimpleBlocksIT.testAddBlockWhileDeletingIndices

[nknize]

Caught in #2460; similar to #2442 looks like a timeout issue. Reporting for posterity.

REPRODUCE WITH: ./gradlew ':server:internalClusterTest' --tests "org.opensearch.blocks.SimpleBlocksIT.testAddBlockWhileDeletingIndices" -Dtests.seed=C3B75188D6A82B5A -Dtests.security.manager=true -Dtests.jvm.argline="-XX:TieredStopAtLevel=1 -XX:ReservedCodeCacheSize=64m" -Dtests.locale=es-BO -Dtests.timezone=Europe/Saratov -Druntime.java=17

org.opensearch.blocks.SimpleBlocksIT > testAddBlockWhileDeletingIndices FAILED
    com.carrotsearch.randomizedtesting.UncaughtExceptionError: Captured an uncaught exception in thread: Thread[id=835, name=Thread-14, state=RUNNABLE, group=TGRP-SimpleBlocksIT]

        Caused by:
        java.lang.AssertionError: 
        Expected: an instance of org.opensearch.index.IndexNotFoundException
             but: <ProcessClusterEventTimeoutException[failed to process cluster event (delete-index [[aldbjmgedp/08nkaMzBSV2g7lVyZb2mJg]]) within 30s]> is a org.opensearch.cluster.metadata.ProcessClusterEventTimeoutException
            at __randomizedtesting.SeedInfo.seed([C3B75188D6A82B5A]:0)
            at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:18)
            at org.junit.Assert.assertThat(Assert.java:964)
            at org.junit.Assert.assertThat(Assert.java:930)
            at org.opensearch.blocks.SimpleBlocksIT.lambda$testAddBlockWhileDeletingIndices$14(SimpleBlocksIT.java:483)
            at org.opensearch.blocks.SimpleBlocksIT.lambda$testAddBlockWhileDeletingIndices$15(SimpleBlocksIT.java:498)

[ankitkala]

Not able to reproduce this test locally after 10K+ iterations.

I did simulate the error by manually throwing the exception in cluster state task for delete index. Since the test fails due to cluster state submit task not finishing within 30 seconds timeout, I've added retries for this exception which should help incase of such transient issues.