#39604 - Change top-right avatar immediately upon avatar change

First attempt at contributing to GitLab! I've set this as WIP because I feel like I should write a test, but I'm not too sure what kind of test and where you'd want it. A little pointer would be great.

I wasn't sure if I should check items off on the acceptance criteria, as it feels more like something a reviewer should do.

What does this MR do?

After a user successfully changes their avatar, this MR will ensure that the little avatar in the header is updated as well. Previously, this required a page reload.

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

• Check if my use of jQuery is acceptable here
• Let me know if a test is required for this, and if so, what kind of test is preferred? It's a very tiny change, but totally testable if I'm aware what kind of test it needs to be.

Why was this MR needed?

Because there's an issue, which is labelled ~"Accepting Merge Requests" and ~"Community Contribution". Current behaviour feels a little unpolished.

Screenshots (if relevant)

I'd leave a gif or something, but I'm currently not on a machine with an easy way of doing this. A screenshot wouldn't show anything different.

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests added for this feature/bug
• Conform by the code review guidelines
  • Has been reviewed by a UX Designer
  • Has been reviewed by a Frontend maintainer
  • Has been reviewed by a Backend maintainer
  • Has been reviewed by a Database specialist
• Conform by the merge request performance guides
• Conform by the style guides
• If you have multiple commits, please combine them into a few logically organized commits by squashing them
• Internationalization required/considered
• End-to-end tests pass (package-and-qa manual pipeline job)

What are the relevant issue numbers?

Closes #39604 (closed)