Accept proxy protocol when TLS passthrough enabled

[haywoodsh]

Proposed changes

Accept requests with proxy protocol header at port 443 when TLS Passthrough is enabled to retrieve client IP.

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

[codecov-commenter]

Codecov Report

Merging #2993 (8212284) into main (f541ddb) will decrease coverage by 0.72%.
The diff coverage is 16.34%.

@@            Coverage Diff             @@
##             main    #2993      +/-   ##
==========================================
- Coverage   53.01%   52.28%   -0.73%     
==========================================
  Files          58       58              
  Lines       15645    15997     +352     
==========================================
+ Hits         8294     8364      +70     
- Misses       7072     7354     +282     
  Partials      279      279              

Impacted Files	Coverage Δ
cmd/nginx-ingress/main.go	0.00% <0.00%> (ø)
internal/configs/config_params.go	76.74% <ø> (ø)
internal/configs/configurator.go	37.38% <0.00%> (-0.08%)	⬇️
internal/configs/version1/config.go	0.00% <ø> (ø)
internal/externaldns/controller.go	0.00% <0.00%> (ø)
internal/k8s/leader.go	0.00% <0.00%> (ø)
internal/k8s/controller.go	11.11% <4.44%> (-0.60%)	⬇️
internal/k8s/status.go	33.27% <23.63%> (-0.97%)	⬇️
internal/certmanager/cm_controller.go	18.04% <40.00%> (-0.76%)	⬇️
internal/externaldns/sync.go	36.95% <66.66%> (+0.64%)	⬆️
... and 12 more

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more