Fixing Avatar in WebIDE Statusbar showing wrong Avatar for current_user

What does this MR do?

Closes: #31638 (closed)

This MR adds functionality to make sure the current_users avatar will correctly be used in the status bar at the bottom of the IDE. There was a big disconnect to be able to connect a commit to the current user, so I added support for the current users email to gon and use it to retrieve the proper avatar url. Alongside I introduced a new computed property on the IDE status bar component to be explicit about selecting the right user avatar. While doing this I simplified some of the JS code to be easier to follow and more explicit.

Screenshots

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Code review guidelines

Availability and Testing

Added specs on JS side, did not find specs around the Gon assignments on the backend.

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.