Merge branch '37-send-information-on-how-the-questionnaire-has-been-answered-for-each-training-phase' into 'master'

Questionnaire fulfillemnt is sent as part of the decission matrix row.

Closes #37

See merge request !35

Fixed obtaining Sankey Data

Closes #36

See merge request !34

Update V1__db_adaptive_trainings_schema.sql - add access_token unique for access_token and training_instance tables

Update V1__db_adaptive_trainings_schema.sql to add unique constraint for participant_ref_id and training_instance_id

Resolve "Fix force delete of training instance"

Closes #35

See merge request muni-kypo/kypolab/kypo-adaptive-training!33