feat(kong): allow customizing chart version and proxy readiness probe

[czeslavo]

Adds WithHelmChartVersion and WithProxyReadinessProbePath Kong addon builder methods. Modifies the WithControllerDisabled method to also alter the proxyReadinessProbePath to /status so that the installation succeeds if the controller is disabled (otherwise /status/ready default would be used which expects Gateway to have a non-empty config loaded/configured).

[codecov-commenter]

Codecov Report

Patch coverage: 29.41% and project coverage change: -38.91% ⚠️

Comparison is base (d6d384b) 59.70% compared to head (ddfc98f) 20.79%.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #774       +/-   ##
===========================================
- Coverage   59.70%   20.79%   -38.91%     
===========================================
  Files          48       48               
  Lines        3886     3900       +14     
===========================================
- Hits         2320      811     -1509     
- Misses       1271     2965     +1694     
+ Partials      295      124      -171     

Flag	Coverage Δ
integration-test	20.79% <29.41%> (-38.91%)	⬇️

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Files Changed	Coverage Δ
pkg/clusters/addons/kong/addon.go	17.76% <0.00%> (-40.67%)	⬇️
pkg/clusters/addons/kong/builder.go	53.84% <45.45%> (-33.66%)	⬇️

... and 34 files with indirect coverage changes

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