Fixed merge request tabs extra margin
What does this MR do?
Fixed extra margin when the merge request tabs are affixed
This was caused by some weird padding that was on the container & then not correctly removed.
The fix involved removing the container from inside the tabs holder div & then adding the widths through CSS depending on if fixed & whether the parent is limited width or not.
This has been tested with both sidebars open & closed & with both fluid & limited settings.
Screenshots (if relevant)
What are the relevant issue numbers?
Closes #26853 (closed)