Ensure all split methods consuming Keys check that key is fully specified
STUD-1654
Youtube Video Quality Button Tests
stop update_assets commands from being called extra times
Add Studio handling for changes to group configurations

STUD-1658
Introduce constants for studio_view, student_view, and author_view.
Complete Studio support for handling group configuration changes

STUD-1658
Merge pull request #4155 from edx/dhm/stud-1654

Ensure all split methods consuming Keys check that key is fully specified
Merge pull request #4112 from edx/ammar/youtube-video-quality-tests

Youtube Video Quality Button Tests
Disable periodically failing Bok Choy test
Merge pull request #3999 from edx/christina/updating-split-test

Ability to change the associated group configuration for a split test
Replace unit page with the container page.

STUD-1754