[Workbench2] Fix user management UI
Currently, WB2 provides admins with a users panel and a user management modal (right click a user or click on the actions triple-dot, and click on Manage).
- Using this admin panel to log in as a different user shows their projects panel, but you are still logged in as the admin. For example, adding a new project adds it to the admin account.
- Clicking on "Set up shell account for X" brings up a different modal. On submit, this modal doesn't close. You have to click "Cancel".
- From the users page, clicking "New User" and submitting the form doesn't do anything.
- On the users page, there is an inactive "Activity" tab.