Fix flaky tests due to hashed prefix path type snapshots

[ashking94]

Description

In the build of main branch after PR merge, saw couple of more tests that have become flaky. Build link - https://build.ci.opensearch.org/job/gradle-check/46090/. In this PR, we are fixing the tests -

1. org.opensearch.snapshots.RepositoriesIT.testRepositoryCreation - In this test, there is a check to validate that the cluster state uuid has not changed since the update repository does not mutate the repository. I have addded a simple check that checks if the metadata settings have changed or not. If not changed, then the cluster state uuid should also not change.
2. org.opensearch.snapshots.SnapshotStatusApisIT.testExceptionOnMissingShardLevelSnapBlob - This test was trying to resolve the path for 0th shard of an index by assuming fixed path structure. This has now been changed to use abstract method which disambiguates the path.

Check List

• Functionality includes testing.
• [ ] API changes companion pull request created, if applicable.
• [ ] Public documentation issue/PR created, if applicable.

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[github-actions]

❌ Gradle check result for 0cb4127: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[github-actions]

❕ Gradle check result for 9fbae1d: UNSTABLE

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]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.79%. Comparing base (71d122b) to head (9fbae1d).
Report is 4 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #15560      +/-   ##
============================================
- Coverage     71.99%   71.79%   -0.20%     
+ Complexity    63700    63619      -81     
============================================
  Files          5248     5249       +1     
  Lines        297416   297643     +227     
  Branches      42984    43011      +27     
============================================
- Hits         214113   213699     -414     
- Misses        65776    66364     +588     
- Partials      17527    17580      +53     

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[ashking94]

❕ Gradle check result for 9fbae1d: UNSTABLE

Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

Flaky test - #14293