Mute SearchableSnapshotIT.testCacheFilesAreClosedAfterUse pending fix

[andrross]

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed per the DCO using --signoff
• Commit changes are listed out in CHANGELOG.md file (See: Changelog)

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[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: UNSTABLE ❕
• TEST FAILURES:

      1 org.opensearch.backwards.MixedClusterClientYamlTestSuiteIT.test {p0=indices.split/30_copy_settings/Copy settings during split index}
      1 org.opensearch.backwards.MixedClusterClientYamlTestSuiteIT.test {p0=indices.shrink/30_copy_settings/Copy settings during shrink index}

• URL: https://build.ci.opensearch.org/job/gradle-check/13066/
• CommitID: 5c95337
  Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

[codecov-commenter]

Codecov Report

Merging #6889 (5c95337) into main (7b708c4) will increase coverage by 0.17%.
The diff coverage is 0.00%.

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@@             Coverage Diff              @@
##               main    #6889      +/-   ##
============================================
+ Coverage     70.52%   70.69%   +0.17%     
- Complexity    59112    59226     +114     
============================================
  Files          4814     4812       -2     
  Lines        283743   283748       +5     
  Branches      40915    40916       +1     
============================================
+ Hits         200110   200602     +492     
+ Misses        67154    66640     -514     
- Partials      16479    16506      +27     

Impacted Files	Coverage Δ
...ark/store/remote/filecache/FileCacheBenchmark.java	0.00% <0.00%> (ø)

... and 521 files with indirect coverage changes

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