Migrate protected tag error form

What does this MR do and why?

Migrate errors form for protected tag project repository settings

Closes #364940 (closed)

Screenshots or screen recordings

Before	After

How to set up and validate locally

1. Open a project where you have admin rights
2. Navigate to Settings -> Repository http://localhost:3000/flightjs/Flight/-/settings/repository
3. Expand Protected tag section
4. Trigger an error, for example by adding this line to the haml - @protected_tag.errors.add(:base, "Something went wrong")
5. Observe change form error

MR acceptance checklist

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• I have evaluated the MR acceptance checklist for this MR.