Defaulting to a plaintext response makes no sense for an endpoint that is intended to be used by machines for testing. The endpoint now returns JSON only unless a redirect action is triggered.

- Removed unused imports
- Ran isort to properly order/style imports

Replacing relative imports by absolute imports for all files into common/test/acceptance/fixtures directory

SOL-1, SOL-2, SOL-3

Change text in bok_choy scripts to green
Added feedback check for AI-assessment test
Added peer assessment feedback test
Updated Studio/LMS page objects and tests to use bok-choy v0.1.0
Added LMS bok-choy tests from e2e repo

Added fixtures for course and xblock creation
Added bok-choy Studio tests
Added bok-choy tests for ora self- and ai- assessment
Refactored auto-auth; added staff and course-enrollment options
Removed extra javascript properties from page objects