Changes to Apply Course Chat Action

added the new excellence_course enum value to the course/source_type/anyOf[subschema #1] response property for the response status 200

added the new interactive enum value to the course/units/anyOf[subschema #1]/items/blocks/anyOf[subschema #1]/items/type response property for the response status 200

added the new video enum value to the course/units/anyOf[subschema #1]/items/blocks/anyOf[subschema #1]/items/type response property for the response status 200

added the optional property course/append_error_message to the response with the 200 status

added the optional property course/append_started_at to the response with the 200 status

added the optional property course/append_status to the response with the 200 status

added the optional property course/excellence_content_signature to the response with the 200 status

added the optional property course/excellence_course_key to the response with the 200 status

added the optional property course/excellence_unmodified to the response with the 200 status

added the new optional request property operations/items/block_id

added the non-success response with the status 409

added the optional property course/units/anyOf[subschema #1]/items/blocks to the response with the 200 status