KAFKA-19299: Fix race condition in RemoteIndexCacheTest #19927
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This MR should be couple of race conditions in RemoteIndexCacheTest.
After fix test were run 10000 times with repeated test annotation:
./gradlew clean storage:test --tests org.apache.kafka.storage.internals.log.RemoteIndexCacheTest.testCacheEntryIsDeletedOnRemoval
...
Gradle Test Run :storage:test > Gradle Test Executor 20 > RemoteIndexCacheTest > testCacheEntryIsDeletedOnRemoval() > repetition 9998 of 10000 PASSED
Gradle Test Run :storage:test > Gradle Test Executor 20 > RemoteIndexCacheTest > testCacheEntryIsDeletedOnRemoval() > repetition 9999 of 10000 PASSED
Gradle Test Run :storage:test > Gradle Test Executor 20 > RemoteIndexCacheTest > testCacheEntryIsDeletedOnRemoval() > repetition 10000 of 10000 PASSED
BUILD SUCCESSFUL in 20m 9s
148 actionable tasks: 148 executed