feat: support patching on EnvoyProxy.spec.provider.kubernetes.envoyHpa and EnvoyProxy.spec.provider.kubernetes.envoyPDB

[keithfz]

What type of PR is this?

This is an enhancement to enable a patch option for EnvoyProxy.spec.provider.kubernetes.envoyHpa and EnvoyProxy.spec.provider.kubernetes.envoyPDB in the EnvoyProxy API.

What this PR does / why we need it:
This PR adds a patch field for EnvoyProxy.spec.provider.kubernetes.envoyHpa and EnvoyProxy.spec.provider.kubernetes.envoyPDB. To apply the patch, we use the same mechanism that we use for patching other resources in the EnvoyProxy API, such as envoyDeployment, envoyDaemonSet, and envoyService.

Which issue(s) this PR fixes:

Fixes #4894

Release Notes: Yes

[codecov]

Codecov Report

Attention: Patch coverage is 63.63636% with 36 lines in your changes missing coverage. Please review.

Project coverage is 66.26%. Comparing base (d33b617) to head (de3dcce).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
api/v1alpha1/kubernetes_helpers.go	59.25%	16 Missing and 6 partials ⚠️
...frastructure/kubernetes/proxy/resource_provider.go	46.66%	5 Missing and 3 partials ⚠️
api/v1alpha1/validation/envoyproxy_validate.go	80.00%	4 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4910      +/-   ##
==========================================
- Coverage   66.28%   66.26%   -0.03%     
==========================================
  Files         209      209              
  Lines       31942    32035      +93     
==========================================
+ Hits        21172    21227      +55     
- Misses       9517     9546      +29     
- Partials     1253     1262       +9     

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[keithfz]

bleh - apologies on the lint stuff, first time working in this repo 😄

[arkodg]

np thanks for the quick PR, will try and review this by EOD