Moved builds panel to the bottom of the builds sidemenu (and change retry link colour)

What does this MR do?

Moves the builds panel to the bottom of the builds sidemenu.

Changes the Retry link to look more linky. 🖇

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

On small screens, the builds panel must be scrolled through before you can get to the details of the build you're looking at.

What are the relevant issue numbers?

Closes #21122 (closed)

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• CHANGELOG entry added
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the style guides
• Branch has no merge conflicts with master (if you do - rebase it please)
• Squashed related commits together Closes #21122 (closed)