[FEATURE] CI - stop PR's where helm-docs hasn't run

[hawksight]

Is your feature request related to a problem? Please describe.

Stop PR's where helm-docs hasn't run

Describe the solution you'd like

In PR CI, run helm-docs and fail if changes are detected.

Describe alternatives you've considered

Many headaches.

Additional context

Discussed on version-checker meeting 2024/08/15

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[hawksight]

@davidcollom i found this action: https://github.com/marketplace/actions/helm-docs-github-action

Maybe we just configure this instead of this workflow?

I have an internal reference you can probably see here, just failing if not ran: here