Improve auto OAuth2 for permission request changes

[madprime]

Description

Avoid "auto authorization" when requested permissions change for an OAuth2 project.

This is done by checking permissions and redirecting to reload the same endpoint with an updated approval_prompt parameter, thus prompting re-authorization by the user.

Related Issue

#1076

Testing

• passed automated testing locally
• ran locally to test manually:
  • reproduced incorrect auto auth when permissions update
  • confirmed corrected behavior