fix: Update provider features list for discussions

This Pr updates the features list of the discussion providers for,
1. Combines LTI basic configuration and LTI integration into 1 feature.
2.Enables Primary discussion app experience for Yellowdig
3. Hides Automatic learner enrollment from this list

FE changes (in Other PR):
1. Turn edX to Full Support instead of partial support
2. Rename Partial support to Basic support

https://openedx.atlassian.net/browse/TNL-8546