Refactor branch protection select to use Pajamas component

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Summary

I think we could improve the branch protection selector. The options are very information dense. It's difficult to get the gist of it and to read in full.

With the Pajamas Dropdown component we can display HTML in the options to highlight certain text in order to improve readability.

Improvements

Gl-Dropdown

image

vs the current <select>

image

Edited by 🤖 GitLab Bot 🤖