[Backport 2.17] Abstract out RemoteFsTranslogWithPinnedTimestamps

[opensearch-trigger-bot]

Backport deeb2de from #15579.

[github-actions]

❌ Gradle check result for 788b696: 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 788b696: 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 85.62874% with 24 lines in your changes missing coverage. Please review.

Project coverage is 71.69%. Comparing base (d000171) to head (788b696).
Report is 2 commits behind head on 2.17.

Files with missing lines	Patch %	Lines
...index/translog/RemoteFsTimestampAwareTranslog.java	84.61%	17 Missing and 5 partials ⚠️
...rg/opensearch/index/translog/RemoteFsTranslog.java	90.47%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               2.17   #15636      +/-   ##
============================================
- Coverage     72.11%   71.69%   -0.43%     
+ Complexity    64396    64047     -349     
============================================
  Files          5244     5245       +1     
  Lines        299367   299400      +33     
  Branches      43575    43581       +6     
============================================
- Hits         215901   214653    -1248     
- Misses        65723    66755    +1032     
- Partials      17743    17992     +249     

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