chore: webhook integration test module upgrade

[vinayteki95]

Description

Webhook integration tests module is modified to handle v2 spec based test cases generation in transformer repo.

Linear Ticket

Resolves INT-3149
https://linear.app/rudderstack/issue/INT-3149/webhook-integration-tests-upgrade-server-test-parser-transformer-tests

Security

• The code changed/added as part of this pull request won't create any security issues with how the software is being used.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.03%. Comparing base (2435cba) to head (8c92d30).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5665      +/-   ##
==========================================
+ Coverage   76.95%   77.03%   +0.08%     
==========================================
  Files         487      487              
  Lines       66041    66041              
==========================================
+ Hits        50823    50876      +53     
+ Misses      12456    12417      -39     
+ Partials     2762     2748      -14     

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