Resolve "Add status message from within user menu"

What does this MR do?

Allows a user to set their status via the user menu.

What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ce/issues/49075

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• Tests added for this feature/bug
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides

Closes #49075 (closed), #51393 (closed)