Use chart-testing to lint the Helm Chart

[lucacome]

Proposed changes

Problem: We want to validate all the files related to the helm chart and not just run helm lint

Solution: Use helm/chart-testing

Closes #2043

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

[sjberman]

Looking at the pipeline, it looks like it ran on version 1.2.0, not latest main? Or is that just printing out the latest tag?

[sjberman]

This log in the pipeline run: nginx-gateway-fabric => (version: "1.2.0", path: "charts/nginx-gateway-fabric"), doesn't mean it's running on the 1.2.0 tag, does it? It just detects the latest version and prints it I hope?

[lucacome]

yeah it prints the version in Chart.yaml

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.61%. Comparing base (16f0835) to head (d5c91ad).

❗ Current head d5c91ad differs from pull request most recent head 6559f9c

Please upload reports for the commit 6559f9c to get more accurate results.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2027   +/-   ##
=======================================
  Coverage   87.61%   87.61%           
=======================================
  Files          96       96           
  Lines        6694     6694           
  Branches       50       50           
=======================================
  Hits         5865     5865           
  Misses        773      773           
  Partials       56       56           

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