Add field to NginxProxy to allow disabling HTTP2

[ciarams87]

Proposed changes

Problem: We need a way to allow a user to disable HTTP2

Solution: Extend the NginxProxy CRD to include a DisableHTTP2 option which will apply to all servers

Testing: Unit and local testing, confirmed that the http2 directive is set correctly unless disabled. If disabled, confirmed that a condition is added to any GRPCRoutes.

Closes #1858

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.

Added configuration option to disable HTTP2 to the NginxProxy CRD

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.96%. Comparing base (869ac38) to head (1e02137).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1925      +/-   ##
==========================================
+ Coverage   86.90%   86.96%   +0.05%     
==========================================
  Files          88       89       +1     
  Lines        6056     6083      +27     
  Branches       50       50              
==========================================
+ Hits         5263     5290      +27     
  Misses        741      741              
  Partials       52       52              

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[kate-osborn]

Just a couple nits