Add functionality to have Playwright tests mimic admin actions

[DanielRyanSmith]

Currently, the Playwright tests only support mocking the login of a generic user "[email protected]". None of the Playwright tests mock any action that could be taken by admins, and do not test any states that would be present after an admin has taken action. Our UI testing support could be more robust by testing these admin actions, or at least the states seen after admin actions (gate chip approvals, etc.).