Fix compileTestKotlin FAILED due to create snapshot workflow change

[zhichao-aws]

Issue #, if available:
#824

Description of changes:
add field remoteStoreIndexShallowCopy in SM TestUtils

CheckList:

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[zhichao-aws]

failed integTests are caused by #8206. We can ignore the null return value to keep the same behavior of previous code here. Should fix it in another PR. Will withdraw the last commit

[codecov]

Codecov Report

Merging #825 (4213f24) into main (42833b1) will increase coverage by 0.25%.
The diff coverage is 100.00%.

❗ Current head 4213f24 differs from pull request most recent head ca28e20. Consider uploading reports for the commit ca28e20 to get more accurate results

@@             Coverage Diff              @@
##               main     #825      +/-   ##
============================================
+ Coverage     75.53%   75.79%   +0.25%     
- Complexity     2831     2848      +17     
============================================
  Files           364      364              
  Lines         16176    16176              
  Branches       2324     2325       +1     
============================================
+ Hits          12219    12261      +42     
+ Misses         2619     2572      -47     
- Partials       1338     1343       +5     

Impacted Files	Coverage Δ
...earch/indexmanagement/transform/model/Transform.kt	85.16% <100.00%> (ø)

... and 10 files with indirect coverage changes

[zhichao-aws]

Please help add backport 2.x label. The workflow changing PR in core was backported to 2.x https://github.com/opensearch-project/OpenSearch/pull/8071/files .