Make MR header fluid-width on changes tab

What does this MR do and why?

Removes container around the MR changes tab

Why?

When we made the changes tab content fluid width, we kept a container around the header so it would remain in the same place while users switch tabs. While this is a nice experience in theory, it looks kind of weird and buggy in practice.

Since we're experimenting with other UI changes, I thought now would be a good time to remove this hourglass-container situation and just go completely full-width on the Changes tab

What does this MR not do?

Screenshots or screen recordings

Before After
Screenshot_2025-09-23_at_12.21.22_PM Screenshot_2025-09-23_at_12.20.17_PM

How to set up and validate locally

  • Enable project studio
  • Go to MR
  • Click Changes

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