test: onboard registry GCP conformance test

[roseyang62]

Summary

< Provide a brief description of the changes in this PR >

Some conventions to follow

1. add the module name as a prefix
   • for example: add a prefix: docstore: for document store module, blobstore for Blob Store module
2. for a test only PR, add test:
3. for a perf improvement only PR, add perf:
4. for a refactoring only PR, add "refactor:"

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.06%. Comparing base (5a56444) to head (6d254cf).

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #335   +/-   ##
=========================================
  Coverage     82.06%   82.06%           
- Complexity      553      554    +1     
=========================================
  Files           183      183           
  Lines         11238    11242    +4     
  Branches       1498     1498           
=========================================
+ Hits           9222     9226    +4     
  Misses         1351     1351           
  Partials        665      665           

Flag	Coverage Δ
unittests	82.06% <100.00%> (+<0.01%)	⬆️

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