Clean up warnings in backend tests

[RaymondLuong3]

This cleans up the warning for obsolete SourceQuoteConvention in the MachineApiServiceTests class

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This change is 

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.91%. Comparing base (27b050e) to head (beeeff5).
⚠️ Report is 1 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3683   +/-   ##
=======================================
  Coverage   81.91%   81.91%           
=======================================
  Files         618      618           
  Lines       38568    38568           
  Branches     6311     6306    -5     
=======================================
  Hits        31594    31594           
  Misses       6000     6000           
  Partials      974      974           

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[Nateowami]

@Nateowami reviewed 1 file and all commit messages, and made 1 comment.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @RaymondLuong3).