[Backport 2.x] 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 #506 (6f9b446) into 2.x (5959754) will increase coverage by 1.92%.
The diff coverage is 50.00%.

❗ Current head 6f9b446 differs from pull request most recent head d261d96. Consider uploading reports for the commit d261d96 to get more accurate results

@@             Coverage Diff              @@
##                2.x     #506      +/-   ##
============================================
+ Coverage     72.55%   74.47%   +1.92%     
- Complexity      984     1004      +20     
============================================
  Files           141      141              
  Lines          4576     4580       +4     
  Branches        506      509       +3     
============================================
+ Hits           3320     3411      +91     
+ Misses          936      850      -86     
+ Partials        320      319       -1     

Impacted Files	Coverage Δ
...action/stop/TransportStopIndexReplicationAction.kt	60.75% <50.00%> (-12.58%)	⬇️
...arch/replication/metadata/UpdateMetadataRequest.kt	77.27% <0.00%> (-22.73%)	⬇️
.../action/status/TransportReplicationStatusAction.kt	97.82% <0.00%> (+1.08%)	⬆️
.../replication/action/index/ReplicateIndexRequest.kt	63.52% <0.00%> (+1.17%)	⬆️
...ication/metadata/store/ReplicationMetadataStore.kt	68.88% <0.00%> (+1.48%)	⬆️
...arch/replication/task/autofollow/AutoFollowTask.kt	72.97% <0.00%> (+2.02%)	⬆️
...rch/replication/task/shard/ShardReplicationTask.kt	75.91% <0.00%> (+2.18%)	⬆️
...org/opensearch/replication/util/SecurityContext.kt	73.52% <0.00%> (+2.94%)	⬆️
.../replication/repository/RemoteClusterRepository.kt	75.73% <0.00%> (+2.94%)	⬆️
... and 16 more

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