feat(main): add test webhooks

[cuisongliu]

This pull request introduces a new test case to the api/v1beta1/webhook_suite_test.go file. The test case verifies that the Controller.Replicas field is immutable by attempting to update it and checking for the appropriate error message.

Testing enhancements:

• api/v1beta1/webhook_suite_test.go: Added a new test case It("Update Controller Replicas", func() { to ensure that the Controller.Replicas field cannot be updated and that the correct error messages are returned.

[codecov]

Codecov Report

Attention: Patch coverage is 76.66667% with 7 lines in your changes missing coverage. Please review.

Project coverage is 30.48%. Comparing base (b65beac) to head (d582a29).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
e2e/utils.go	76.66%	5 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #56      +/-   ##
==========================================
+ Coverage   27.74%   30.48%   +2.74%     
==========================================
  Files           4        4              
  Lines         310      351      +41     
==========================================
+ Hits           86      107      +21     
- Misses        203      224      +21     
+ Partials       21       20       -1     

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