JetBrains: Add Login and Settings links to popup header
Created by: vdavid
Design: https://www.figma.com/file/nmNPZGYCoGIUN0YMylmPTT/JetBrains-plugin-MLP?node-id=2055%3A22294
- For now, the auth button should also point to Settings. The final action depends on the changes made in https://github.com/sourcegraph/sourcegraph/issues/36783.
- The auth button should only be visible if the user is not authenticated.
- The settings button should close the popup and open Settings.
Thanks to the work that's been done last week, this is a small development.