[STRATCONN-3911] GEC - Fix for retryable errors

[sayan-das-in]

While adding audience to GEC, the endpoints sometimes throws CONCURRENT MODIFICATION which is a retryable error, but Google responds with a 400 error causing the event to be dropped.

This PR adds a fix to check for CONCURRENT MODIFICATION errors and rewrite those errors to retryable 500 errors.

Testing

Tested via Hadron

Result

Diff

• Added unit tests for new functionality
• Tested end-to-end using the local server
• [If destination is already live] Tested for backward compatibility of destination. Note: New required fields are a breaking change.
• [Segmenters] Tested in the staging environment
• [Segmenters] [If applicable for this change] Tested for regression with Hadron.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 78.42%. Comparing base (718fd6c) to head (3cc80a9).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...tinations/google-enhanced-conversions/functions.ts	50.00%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2577      +/-   ##
==========================================
- Coverage   79.19%   78.42%   -0.78%     
==========================================
  Files        1259     1012     -247     
  Lines       23485    17797    -5688     
  Branches     4776     3354    -1422     
==========================================
- Hits        18599    13957    -4642     
+ Misses       3758     2716    -1042     
+ Partials     1128     1124       -4     

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[itsarijitray]

LGTM! 🚀