Change RemoteSegmentStoreDirectory init at given timestamp to ignore pinned timestamp setting

[sachinpkale]

Description

• This PR addresses following comments on the earlier PRs:
  • Add support to skip pinned timestamp in remote segment garbage collector #15017 (comment)
  • https://github.com/opensearch-project/OpenSearch/pull/15180/files#r1719741169

Check List

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

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[github-actions]

❕ Gradle check result for 627a6b7: 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 75.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 71.95%. Comparing base (c771bdd) to head (627a6b7).
Report is 29 commits behind head on main.

Files with missing lines	Patch %	Lines
server/src/main/java/org/opensearch/node/Node.java	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##               main   #15457   +/-   ##
=========================================
  Coverage     71.95%   71.95%           
- Complexity    63286    63335   +49     
=========================================
  Files          5225     5225           
  Lines        296215   296216    +1     
  Branches      42788    42788           
=========================================
+ Hits         213133   213154   +21     
- Misses        65559    65566    +7     
+ Partials      17523    17496   -27     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.