fix integ test failures

[riysaxen-amzn]

Removed assertion from integ tests causing build failure in jenkins

https://build.ci.opensearch.org/blue/organizations/jenkins/integ-test/detail/integ-test/8329/pipeline/126

If the tests are running on a cluster that has more than just the alerting plugin installed on it, there might be indexes for those plugins created as well, the subsequent assertions are more important, so removed the assertion that checks how many indices exist

Test faIlures in jenkins integ test:

Suite: Test class org.opensearch.alerting.transport.GetRemoteIndexesActionIT

  2> REPRODUCE WITH: ./gradlew ':alerting:integTest' --tests "org.opensearch.alerting.transport.GetRemoteIndexesActionIT.test with TRUE include_mappings param" -Dtests.seed=C75572776830D42C -Dtests.security.manager=false -Dtests.locale=ro -Dtests.timezone=Pacific/Enderbury -Druntime.java=21

  2> java.lang.AssertionError: expected:<2> but was:<3>

        at __randomizedtesting.SeedInfo.seed([C75572776830D42C:273B758717CBD74]:0)

        at org.junit.Assert.fail(Assert.java:89)

        at org.junit.Assert.failNotEquals(Assert.java:835)

        at org.junit.Assert.assertEquals(Assert.java:120)

        at org.junit.Assert.assertEquals(Assert.java:146)

        at org.opensearch.alerting.transport.GetRemoteIndexesActionIT.test with TRUE include_mappings param(GetRemoteIndexesActionIT.kt:205)

  2> REPRODUCE WITH: ./gradlew ':alerting:integTest' --tests "org.opensearch.alerting.transport.GetRemoteIndexesActionIT.test with FALSE include_mappings param" -Dtests.seed=C75572776830D42C -Dtests.security.manager=false -Dtests.locale=ro -Dtests.timezone=Pacific/Enderbury -Druntime.java=21

  2> java.lang.AssertionError: expected:<2> but was:<3>

        at __randomizedtesting.SeedInfo.seed([C75572776830D42C:5240C08E4E2190E6]:0)

        at org.junit.Assert.fail(Assert.java:89)

        at org.junit.Assert.failNotEquals(Assert.java:835)

        at org.junit.Assert.assertEquals(Assert.java:120)

        at org.junit.Assert.assertEquals(Assert.java:146)

        at org.opensearch.alerting.transport.GetRemoteIndexesActionIT.test with FALSE include_mappings param(GetRemoteIndexesActionIT.kt:156)

  2> REPRODUCE WITH: ./gradlew ':alerting:integTest' --tests "org.opensearch.alerting.transport.GetRemoteIndexesActionIT.test with blank include_mappings param" -Dtests.seed=C75572776830D42C -Dtests.security.manager=false -Dtests.locale=ro -Dtests.timezone=Pacific/Enderbury -Druntime.java=21

  2> java.lang.AssertionError: expected:<2> but was:<3>

        at __randomizedtesting.SeedInfo.seed([C75572776830D42C:21E8F236EC2DDBF]:0)

        at org.junit.Assert.fail(Assert.java:89)

        at org.junit.Assert.failNotEquals(Assert.java:835)

        at org.junit.Assert.assertEquals(Assert.java:120)

        at org.junit.Assert.assertEquals(Assert.java:146)

        at org.opensearch.alerting.transport.GetRemoteIndexesActionIT.test with blank include_mappings param(GetRemoteIndexesActionIT.kt:106)

  2> NOTE: leaving temporary files on disk at: /tmp/tmpk47m_ab0/alerting/alerting/build/testrun/integTest/temp/org.opensearch.alerting.transport.GetRemoteIndexesActionIT_C75572776830D42C-001

  2> NOTE: test params are: codec=Asserting(Lucene99): {}, docValues:{}, maxPointsInLeafNode=705, maxMBSortInHeap=5.417424553640299, sim=Asserting(RandomSimilarity(queryNorm=true): {}), locale=ro, timezone=Pacific/Enderbury

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