Moved weight under labels

What does this MR do?

Moves the 'weight' input under the 'labels' input on issuable creation forms.

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

Is this the only place this is required?

Why was this MR needed?

UX.

What are the relevant issue numbers?

Closes #735 (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