Backport sanity integration tests in remote cluster

[ankitkala]

Description

Backporting these PRs to 2.0:

• added basic sanity tests for single cluster scenario. #393
• Add support to run sanity test on remote cluster #394

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
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[codecov-commenter]

Codecov Report

Merging #395 (fff77cc) into 2.0 (c0a696a) will decrease coverage by 2.15%.
The diff coverage is n/a.

❗ Current head fff77cc differs from pull request most recent head f700040. Consider uploading reports for the commit f700040 to get more accurate results

@@             Coverage Diff              @@
##                2.0     #395      +/-   ##
============================================
- Coverage     72.46%   70.31%   -2.16%     
+ Complexity      973      935      -38     
============================================
  Files           141      141              
  Lines          4554     4554              
  Branches        504      504              
============================================
- Hits           3300     3202      -98     
- Misses          933     1032      +99     
+ Partials        321      320       -1     

Impacted Files	Coverage Δ
...earch/replication/action/stats/NodeStatsRequest.kt	33.33% <0.00%> (-66.67%)	⬇️
...eplication/action/stats/LeaderNodeStatsResponse.kt	42.85% <0.00%> (-57.15%)	⬇️
...arch/replication/metadata/UpdateMetadataRequest.kt	40.90% <0.00%> (-54.55%)	⬇️
.../replication/action/replay/ReplayChangesRequest.kt	50.00% <0.00%> (-50.00%)	⬇️
...replication/action/index/ReplicateIndexResponse.kt	33.33% <0.00%> (-33.34%)	⬇️
...tion/action/index/block/UpdateIndexBlockRequest.kt	35.00% <0.00%> (-30.00%)	⬇️
...replication/action/stats/AutoFollowStatsRequest.kt	71.42% <0.00%> (-28.58%)	⬇️
...opensearch/replication/seqno/RemoteClusterStats.kt	73.01% <0.00%> (-26.99%)	⬇️
...ction/autofollow/UpdateAutoFollowPatternRequest.kt	30.37% <0.00%> (-24.06%)	⬇️
.../replication/action/index/ReplicateIndexRequest.kt	38.82% <0.00%> (-23.53%)	⬇️
... and 30 more

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