Changes to POST `/api/v0/main-frontend/course-credit-registrations/courses/{course_id}/retry-failed` - Puts this course's failed registrations back on the pipeline. Refuses the same rows the single-row retry refuses and reports how many of each it left alone rather than failing the whole call over them. The cap applies to the rows a retry can actually move: the refused ones are counted across the whole course, because they would otherwise sit in the batch forever and a course that accumulated a capful of them could never retry anything again.

added the new already_cancelled enum value to the skipped/items/refusal response property for the response status 200

added the new awaiting_confirmation enum value to the skipped/items/refusal response property for the response status 200

added the new nothing_to_check enum value to the skipped/items/refusal response property for the response status 200

added the new still_in_pipeline enum value to the skipped/items/refusal response property for the response status 200

added the new submission_uncertain_too_recent enum value to the skipped/items/refusal response property for the response status 200

added the new already_submitted enum value to the skipped/items/refusal response property for the response status 200

added the new submission_pending enum value to the skipped/items/refusal response property for the response status 200

removed the required property skipped/items/outcome from the response with the 200 status

added the required property skipped/items/refusal to the response with the 200 status

endpoint added