[Backport 2.0] Modified _stop replication API to remove any stale replication settings on existing index

[opensearch-trigger-bot]

Backport 0bad307 from #410

[codecov-commenter]

Codecov Report

Merging #504 (a43f1df) into 2.0 (f650bed) will decrease coverage by 2.18%.
The diff coverage is 50.00%.

❗ Current head a43f1df differs from pull request most recent head 8301bd9. Consider uploading reports for the commit 8301bd9 to get more accurate results

@@             Coverage Diff              @@
##                2.0     #504      +/-   ##
============================================
- Coverage     75.07%   72.88%   -2.19%     
+ Complexity     1005      983      -22     
============================================
  Files           141      141              
  Lines          4565     4569       +4     
  Branches        504      507       +3     
============================================
- Hits           3427     3330      -97     
- Misses          824      923      +99     
- Partials        314      316       +2     

Impacted Files	Coverage Δ
...action/stop/TransportStopIndexReplicationAction.kt	65.82% <50.00%> (-3.52%)	⬇️
...cation/action/changes/TransportGetChangesAction.kt	63.49% <0.00%> (-26.99%)	⬇️
...arch/replication/metadata/UpdateMetadataRequest.kt	77.27% <0.00%> (-22.73%)	⬇️
...ch/replication/task/index/IndexReplicationState.kt	51.66% <0.00%> (-15.00%)	⬇️
...ication/action/setup/TransportSetupChecksAction.kt	59.52% <0.00%> (-14.29%)	⬇️
...ication/seqno/RemoteClusterRetentionLeaseHelper.kt	80.00% <0.00%> (-11.67%)	⬇️
...tion/repository/RemoteClusterMultiChunkTransfer.kt	90.24% <0.00%> (-9.76%)	⬇️
.../replication/metadata/store/ReplicationMetadata.kt	62.96% <0.00%> (-8.65%)	⬇️
...ication/action/stop/StopIndexReplicationRequest.kt	50.00% <0.00%> (-5.00%)	⬇️
...ion/action/resume/ResumeIndexReplicationRequest.kt	50.00% <0.00%> (-5.00%)	⬇️
... and 16 more

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