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

**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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**Message from the maintainers**:

If you wish to see this enhancement implemented please add a 👍 reaction to this issue! We often sort issues this way to know what to prioritize.