Add functionality for managing judges to admin view of RPEs

[dboyer]

Related to #4316

Currently, admins need to log in as a chapter ambassador in order to view details about judges attending an event including onboarding status and add or delete judges. It would be helpful for admins to have the same team management functionality that ChAs do. This may involve just implementing the same UI that is on the ChA page, but we can discuss other options such as reusing some of our data grid functionality if there is a potentially better approach.

Current admin view:

Current ChA view:

[dboyer]

We're going to pause on implementation of this feature in favor of #4346