Fixes#2104
The collision was causing the frontend to try to call the *superuser* method (in local, where superuser is enabled), but on prod (where it isn't), it was calling the normal method, which takes a different parameter name
When a user now logs in for the first time for any external auth (LDAP, JWT, Keystone, Github, Google, Dex), they will be presented with a confirmation screen that affords them the opportunity to change their Quay-assigned username.
Addresses most of the user issues around #74
Fixes#486
- Extracts out the check plan logic and UI from the new repo page into its own directive (repo-count-checker)
- Adds the new directive to the repo settings panel
- Some additional UI improvements for the repo settings panel
