Add custom annotations into GatewayClass and NginxGateway manifests

[sgavrylenko]

Proposed changes

Based on previous accidentally closed PR-1899

Add custom annotations for GatewayClass and NginxGateway objects.
It can be useful in different cases

Problem: For deploying our service we use ArgoCD. For this, we have a Helm Chart that contains multiple resources that are using CRDs, that are not managed by this helm chart. When trying to sync this application, it fails if at least one CRD is not installed in the cluster. This is expected.

Solution: To work around this problem, we want to use SkipDryRunOnMissingResource option as annotation for GatewayClass and NginxGateway objects from the nginx-gateway-fabric chart

Testing: Helm template works fine.

Checklist

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• 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.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.66%. Comparing base (118488e) to head (c795322).

❗ Current head c795322 differs from pull request most recent head bc40b77

Please upload reports for the commit bc40b77 to get more accurate results.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1993      +/-   ##
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+ Coverage   87.61%   87.66%   +0.04%     
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  Files          96       93       -3     
  Lines        6694     6557     -137     
  Branches       50       50              
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- Hits         5865     5748     -117     
+ Misses        773      753      -20     
  Partials       56       56              

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