api: move healthCheck to healthCheck.active

[arkodg]

Fixes: #2511

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (241e838) 64.64% compared to head (38add42) 64.65%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
internal/gatewayapi/backendtrafficpolicy.go	92.85%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2540      +/-   ##
==========================================
+ Coverage   64.64%   64.65%   +0.01%     
==========================================
  Files         116      116              
  Lines       17797    17809      +12     
==========================================
+ Hits        11504    11515      +11     
- Misses       5556     5558       +2     
+ Partials      737      736       -1     

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