More control over submissions for organizers

Re-run non-finished and non-failed submissions

• Make it possible for organizers to re-run submissions in any status

It is not currently possible to re-run submissions that are stuck in a non-finished or non-failed state. Since submissions are sometimes stuck in those state, organizers might want to re-run all of them until they work correctly, which is currently not possible without first stopping the submission or deleting it entirely.

Delete soft-deleted submissions

• Make it possible for organizers to remove soft-deleted submissions (#2422)

If a participant soft-deletes their submission, the organizer can not delete it anymore, which means that the quota can not be freed by the organizer anymore. This can become a blocking point and should probably be fixed.

Note: We do not want soft-deletion to decrease the quota to avoid abuses.

[Request] Competition option to prevent participants from removing submissions

Do we want to add this organizer option?

• In one hand it can be useful for organizers
• On the other hand it constraining to participants wanting to cleanup their storage quota

Note: submissions that are on the leaderboard can't be removed by participants.

Limit parallel submissions

• Option to limit the number of parallel submissions (typically to 1)
  or
• Option to add a submission cooldown (time before being able to submit again)

The issue contains several separate submission-management requests, with soft-deleted submission removal already marked complete and no files, tests, or entry points named. Start by clarifying which unchecked requirement remains in scope and its desired organizer behavior; done should be defined separately for rerunning submissions, limiting parallel submissions or cooldowns, and any participant-removal option.