Fix google enhanced conversion error parsing

[varadarajan-tw]

This PR fixes HTTP error parsing of Google Enhanced Conversions destination.

Test Doc

Testing

• [] 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 45.45455% with 6 lines in your changes missing coverage. Please review.

Project coverage is 78.46%. Comparing base (c80d11e) to head (1c8ee99).

Files with missing lines	Patch %	Lines
...tinations/google-enhanced-conversions/functions.ts	45.45%	3 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2697      +/-   ##
==========================================
- Coverage   78.90%   78.46%   -0.44%     
==========================================
  Files        1089     1036      -53     
  Lines       21361    18717    -2644     
  Branches     4262     3551     -711     
==========================================
- Hits        16854    14687    -2167     
+ Misses       3310     2838     -472     
+ Partials     1197     1192       -5     

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