Layer dropdowns over right sidebar

What does this MR do?

• Place the award emoji dropdown over the right sidebar
• Place all dropdowns over right sidebar

Why was this MR needed?

• The right sidebar was hiding the award emoji dropdown when both where open on a small screen

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 merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes #27639 (closed)