feat: Add support for overriding status code in response overrides

[arkodg]

Fixes: #4678

[codecov]

Codecov Report

Attention: Patch coverage is 90.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 66.31%. Comparing base (7bb7624) to head (d8f7832).
Report is 15 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/gatewayapi/filters.go	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4900      +/-   ##
==========================================
+ Coverage   66.25%   66.31%   +0.05%     
==========================================
  Files         209      209              
  Lines       31922    31948      +26     
==========================================
+ Hits        21150    21185      +35     
+ Misses       9522     9512      -10     
- Partials     1250     1251       +1     

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