Add label for Helm Chart

[lucacome]

This adds configuration for automatically labeling PRs with helm_chart when there's a change to any of the files in the helm chart directory.
We use those labels to create the sections in the releases, so this change will add a new Helm Chart section if we had any PRs modifying the helm chart.

Since we're having quite a few PRs modifying the helm chart, this will group them together and "highlight" them.

[codecov-commenter]

Codecov Report

Merging #3284 (ad52e4b) into main (02b5896) will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #3284      +/-   ##
==========================================
+ Coverage   52.64%   52.68%   +0.03%     
==========================================
  Files          59       59              
  Lines       16107    16107              
==========================================
+ Hits         8480     8486       +6     
+ Misses       7343     7339       -4     
+ Partials      284      282       -2     

Impacted Files	Coverage Δ
internal/k8s/configuration.go	95.76% <0.00%> (+0.36%)	⬆️
...ternal/k8s/appprotect/app_protect_configuration.go	86.74% <0.00%> (+0.57%)	⬆️

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[tomasohaodha]

Can you please add more detail to the PR description for those not as familiar as you with github actions? "Adds label for Helm Chart changes." is factual but not helpful - we want PRs to be a learning tool not just a review tool. Thanks

[lucacome]

@tomasohaodha added more context.