Implement abstract methods

[monusingh-1]

Description

upstream change opensearch-project/OpenSearch#9105

Implemented

isSystemRepository
getRemoteDownloadThrottleTimeInNanos
getRemoteUploadThrottleTimeInNanos

Issues Resolved

[List any issues this PR will resolve]

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.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov]

Codecov Report

Merging #1121 (2ee1391) into main (9750b78) will increase coverage by 0.36%.
Report is 4 commits behind head on main.
The diff coverage is 25.00%.

❗ Current head 2ee1391 differs from pull request most recent head 9ef2f4a. Consider uploading reports for the commit 9ef2f4a to get more accurate results

@@             Coverage Diff              @@
##               main    #1121      +/-   ##
============================================
+ Coverage     74.85%   75.22%   +0.36%     
- Complexity     1022     1028       +6     
============================================
  Files           141      141              
  Lines          4760     4762       +2     
  Branches        521      521              
============================================
+ Hits           3563     3582      +19     
+ Misses          861      851      -10     
+ Partials        336      329       -7     

Files Changed	Coverage Δ
.../replication/repository/RemoteClusterRepository.kt	71.73% <0.00%> (-1.60%)	⬇️
...tlin/org/opensearch/replication/util/Extensions.kt	63.33% <100.00%> (-0.41%)	⬇️

... and 8 files with indirect coverage changes