Add codec compare in shouldUpgrade method of OpenSearchMergePolicy

[MrChaos1993]

Description

Allow to use UpgradeRequest to change codecs.

Related Issues

Related to description in #13569

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 e2f2630: FAILURE

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[github-actions]

❌ Gradle check result for cf087bd: FAILURE

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[github-actions]

❌ Gradle check result for e0dc807: FAILURE

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[github-actions]

❌ Gradle check result for 8f7be3a: FAILURE

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[github-actions]

❕ Gradle check result for 393c257: 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

Attention: Patch coverage is 66.66667% with 5 lines in your changes missing coverage. Please review.

Project coverage is 72.39%. Comparing base (ffa46ca) to head (7951dda).
Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
.../opensearch/index/shard/OpenSearchMergePolicy.java	66.66%	1 Missing and 3 partials ⚠️
...lucene90/Lucene90StoredFieldsFormatComparator.java	50.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #17491      +/-   ##
============================================
- Coverage     72.43%   72.39%   -0.04%     
+ Complexity    65721    65704      -17     
============================================
  Files          5311     5312       +1     
  Lines        304941   304951      +10     
  Branches      44228    44232       +4     
============================================
- Hits         220890   220778     -112     
- Misses        65952    66111     +159     
+ Partials      18099    18062      -37     

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[github-actions]

❌ Gradle check result for 9444805: 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 7951dda: UNSTABLE

• TEST FAILURES:

      2 org.opensearch.snapshots.DedicatedClusterSnapshotRestoreIT.testSnapshotWithStuckNode

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