feat: Add orphan user removal to the GH sync process

• feat: Add reports that handle unmanaged teams and orphan users

In conjunction with the fix for #45, the 2 added reports gives us context on users that would be removed with the change, as well as other teams that may be impacting the orphan user clean results.

• feat: Add orphan user removal to the GH sync process

This process will revoke access to a GH organization if a user is part of no teams, is not a project bot, or is not an Eclipse Foundation admin user.

Resolves #45