feat(chart): add priorityClassName for control plane pod

[starlightromero]

Proposed changes

Problem: The user is unable to set a priorityClassName for control plane pods. This could mean that the scheduler prioritizes other pods which rely on Nginx Gateway Fabric

Solution: Add a field to the Helm Chart to allow the user to set the priorityClassName for control plane pods.

Testing: Ran make lint-helm, make generate-helm-schema, and make generate-helm-docs

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.

- Allow setting priorityClassName on control plane pods

[nginx-bot]

Hi @starlightromero! Welcome to the project! 🎉

Thanks for opening this pull request!
Be sure to check out our Contributing Guidelines while you wait for someone on the team to review this.

Please make sure to include the issue number in the PR description to automatically close the issue when the PR is merged.
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[github-actions]

✅ All required contributors have signed the F5 CLA for this PR. Thank you!
_{Posted by the CLA Assistant Lite bot.}

[starlightromero]

I have hereby read the F5 CLA and agree to its terms

[sjberman]

Thanks for the contribution!

[bjee19]

Hey @starlightromero, looks like there are still some generated files that weren't updated. When you get the chance, can you run make generate from the project root Makefile just to cover all the bases. Thanks!

[starlightromero]

@bjee19 I rebased and then ran make generate. No additional files have changed

[bjee19]

Oops I'm sorry I gave you the wrong command, could you run make generate-all. That should populate the files in the deploy folder and allow the pipeline to pass. @starlightromero

[sjberman]

Will this deploy okay and be ignored by k8s?

[starlightromero]

Unfortunately, this will not be okay. I can manually update it to an empty string (""). However, does the make command need to be updated as well?

[sjberman]

We could just make this field conditional in the template, so that it's only rendered if it's specified. That way by default it isn't rendered at all.