Add test/staging OAuth redirect URIs to Google Cloud Console

[rdhyee]

When using Google OAuth login on test.unglue.it, Google returns redirect_uri_mismatch because only unglue.it is registered.

Need to add to the Google Cloud OAuth app's authorized redirect URIs:

• https://test.unglue.it/socialauth/complete/google-oauth2/
• https://staging.unglue.it/socialauth/complete/google-oauth2/ (for later)

Requires access to the Google Cloud project that owns the social_auth_google_oauth2_key.

Workaround: Use direct Django login (createsuperuser) for testing.