Use sentence casing for Full report button in merge request widgets

What does this MR do and why?

• Uses sentence case for Full report button on MR widgets (examples in Figma)

Screenshots or screen recordings

Before	After

How to set up and validate locally

I don't have these set up locally (and I don't see an example in the Review app), so the bet way to validate this is probably to look at the actual Changes

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

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