Flaky testUpdate_ContentChangesTypeDelete integration test in main

[Rebits]

Description

In Nightly 12/05/2025, it has been detected that indexer DEB packages are failing due to testUpdate_ContentChangesTypeDelete flaky test
This test failed recently #807, although the proposed fix seems not to fully mitigate the issue

Evidences

Action: https://github.com/wazuh/wazuh-indexer/actions/runs/14961093179/job/42023117793
Trace:

Tests with failures:
 - com.wazuh.contentmanager.updater.ContentUpdaterIT.testUpdate_ContentChangesTypeDelete

  2> REPRODUCE WITH: ./gradlew ':integTest' --tests "com.wazuh.contentmanager.updater.ContentUpdaterIT.testUpdate_ContentChangesTypeDelete" -Dtests.seed=156179922DCEC72B -Dtests.security.manager=true -Dtests.locale=en-AU -Dtests.timezone=Europe/Madrid -Druntime.java=21
  2> java.lang.AssertionError
        at __randomizedtesting.SeedInfo.seed([156179922DCEC72B:92563677BC109C77]:0)
        at org.junit.Assert.fail(Assert.java:87)
        at org.junit.Assert.assertTrue(Assert.java:42)
        at org.junit.Assert.assertFalse(Assert.java:65)
        at org.junit.Assert.assertFalse(Assert.java:75)
        at com.wazuh.contentmanager.updater.ContentUpdaterIT.testUpdate_ContentChangesTypeDelete(ContentUpdaterIT.java:223)
  2> NOTE: leaving temporary files on disk at: /home/runner/work/wazuh-indexer/wazuh-indexer/plugins/content-manager/build/testrun/integTest/temp/com.wazuh.contentmanager.updater.ContentUpdaterIT_156179922DCEC72B-001
  2> NOTE: test params are: codec=Asserting(Lucene912), sim=Asserting(RandomSimilarity(queryNorm=true): {}), locale=en-AU, timezone=Europe/Madrid
  2> NOTE: Linux 6.11.0-1013-azure amd64/Eclipse Adoptium 21.0.7 (64-bit)/cpus=4,threads=1,free=220578584,total=536870912
  2> NOTE: All tests run in this JVM: [ContentManagerPluginIT, ContentUpdaterIT]