Make Audit GDrive integration work like that of workflows

Because this is a patch release, some things that could have been done to make this better have not been done. E.g., the GDriveWorkflows controller probably has some dead code now, although the event listeners for Audit objects and UserRoles have been removed; and Programs and Requests are still Folderable (no reason to migrate away from this just yet).  But it's working and seems to account for all of the "oh no what if" scenarios that I could think of.

Important to note that assigning the evidence folder is restricted to strictly the Audit Lead and admins.  Other Program Owners, even the person who created the Audit, do not have this access unless they are assigned as Audit Lead.

Ref j/CORE-255