fix: restore Gateway API generation (issue #1427).

[battlebyte]

Separate integration tests in kong2kic_integration_test.go and must be explicitly invoked with -tags=integration.
Fix tests to evaluate all yaml objects.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 71.78423% with 68 lines in your changes missing coverage. Please review.

Project coverage is 29.22%. Comparing base (c88f497) to head (3d71193).

Files with missing lines	Patch %	Lines
kong2kic/route.go	71.54%	57 Missing and 11 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1431      +/-   ##
==========================================
+ Coverage   27.51%   29.22%   +1.70%     
==========================================
  Files          61       61              
  Lines        6272     6511     +239     
==========================================
+ Hits         1726     1903     +177     
- Misses       4423     4474      +51     
- Partials      123      134      +11     

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