Cleanup Project Settings > Repository > Protected branches

What does this MR do and why?

Cleanup Project Settings > Repository > Protected branches

Changes:

• Top aligned labels, removed the label style overrides
• Bold card header title to match the table headers from below
• Adjusted select width to make room for it's content

Screenshots or screen recordings

Before	After

How to set up and validate locally

• Go to /flightjs/Flight/-/settings/repository, Protected branches to verify

Related to #361641 (closed)