Restore keyboard shortcuts for "Activity" and "Charts"

What does this MR do?

Fixes #28538 (closed)

Why was this MR needed?

With changes made in #26348 (closed), certain top level nav items moved to 2nd level, and they lost keyboard shortcuts as mentioned here. This MR attempts to restore them back.

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 #28538 (closed)