Quick popover menu when hovering the contributions link

Communicate that users can create new contributions (especially translations) in a quick way.

Acceptance criteria:

1. When users hover the contributions link, show a popover with access to different contribution areas:
   1. "User contributions" links to the contributions page
   2. "Uploaded media" links to "My Uploads" from Commons.
   3. "Translations" links to the Content Translation Dashboard (showing the in-progress translations if the list is not empty, in which case the suggestions one should be shown instead).
2. Items in the list may have blue highlighted mark if there is a relevant element associated with them.
   1. At the moment, it will be present for the "Translations" option the first time the user views this component (to communicate that there is a new way to contribute), only the first time.
3. The popover menu will be shown open initially right after the user enabled the content translation beta feature (to help announce where to translate from).
4. The popover menu will be shown open once to those users that had accessed CX before without going through the contributions entry point (e.g., those that got an invitation to try the beta). That will help them associate a persistent way to access Content Translation.

This popover can be the foundation to support T88600: When creating a new page, suggest doing a translation instead.