CP/DP split: Support nginx debug mode when provisioning Data Plane

[bjee19]

Proposed changes

Support nginx debug mode when provisioning the Data Plane.

Problem: We want to have the option to provision nginx instances in debug mode.

Solution: Add debug field to NginxProxy CRD. Also user can set debug field when installing through Helm by setting the nginx.debug flag.

Testing:

Manually tested that:

When an NginxProxy is attached to a GatewayClass (and there are no other NginxProxy resources on Gateways), if the debug field is changed, all gateway/nginx instances will be restarted and the new instances will use the nginx binary which matches the debug field.

When an NginxProxy is attached to a Gateway, if the debug field is changed, all corresponding nginx instances will be restarted and use the nginx binary which matches the debug fields. This overwrites any setting on the NginxProxy set on the GatewayClass. When the NginxProxy is removed/deleted from the Gateway, the NginxProxy settings on the GatewayClass take over and if they were different, nginx instances are restarted with the settings from the NginxProxy on the GatewayClass.

Initial NginxProxy on installation through Helm correctly has the debug field set if it was specified on installation.

Closes #3115

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

Release notes

If this PR introduces a change that affects users and needs to be mentioned in the release notes,
please add a brief note that summarizes the change.

none

[bjee19]

I will link the documentation changes once I open a PR for it.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.

Project coverage is 79.51%. Comparing base (6337c97) to head (c517dca).
Report is 125 commits behind head on change/control-data-plane-split.

Files with missing lines	Patch %	Lines
internal/mode/static/provisioner/objects.go	0.00%	5 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (6337c97) and HEAD (c517dca). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (6337c97)	HEAD (c517dca)
	3	2

Additional details and impacted files

@@                         Coverage Diff                          @@
##           change/control-data-plane-split    #3147       +/-   ##
====================================================================
- Coverage                            89.74%   79.51%   -10.24%     
====================================================================
  Files                                  109      124       +15     
  Lines                                11150    13475     +2325     
  Branches                                50       62       +12     
====================================================================
+ Hits                                 10007    10714      +707     
- Misses                                1083     2688     +1605     
- Partials                                60       73       +13     

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[salonichf5]

lgtm

[bjee19]

Corresponding docs pr here: nginx/documentation#215