For EE admin users, SCIM identities are now shown under `Admin >
Overview > Users > USER > identity tab`

Changelog: added
EE: true

* Added two columns: `Provider ID` and `Group`
* Use the Pajamas styles for the table
* Add a zero/empty state (no identities) within the table
* Represent the delete and edit actions with icons
* Separated CE from EE functionality
* Added test for helpers and controller

Changelog: changed
EE: true