test: enable doubleAck & testMultipleSendReceiveWithoutBatch in pubsub

[Yaminik1996]

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 83.21%. Comparing base (63bef8f) to head (66cdd25).

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #212   +/-   ##
=========================================
  Coverage     83.21%   83.21%           
  Complexity       91       91           
=========================================
  Files           150      150           
  Lines          8190     8190           
  Branches        950      950           
=========================================
  Hits           6815     6815           
  Misses          925      925           
  Partials        450      450           

Flag	Coverage Δ
unittests	83.21% <ø> (ø)

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