Task/WC-119: Use a Django group to manage project admins

[jarosenb]

Overview:

Updates the process for managing projects as an admin user.
Before: An admin user would impersonate a project member and manage projects as that user.
After: The admin user is added to a "Project Admin" group in Django. Members of this group can view/edit/publish all projects and can interact with project file systems using the service account.

PR Status:

• Ready.
• Work in Progress.
• Hold.

Related Jira tickets:

• WC-119

Summary of Changes:

Testing Steps:

1. Create a group called Project Admin (case-sensitive) in the Django admin interface (https://designsafe.dev/admin/auth/group/)
2. Add your user to this group
3. Go to My Projects. You should see a list of all projects in the database, not just those tied to your user account.
4. Confirm that you have READ access to files in arbitrary projects.

UI Photos:

Notes: