Allow for downloads of Marathon Match submissions

[jmgasper]

REF: https://topcoder.atlassian.net/browse/PROD-3011

Currently, there is no way for members to download Marathon Match submissions. This is an important piece of functionality because these are for “Fun” and for learning purposes so being able to see other users' submission is valuable.

Enhancement request:

Once a MM challenge closes (is in Completed status),

• When a logged-in user is on the “Submissions” tab of a Marathon Match, allow all logged in members to be able to select and download submissions.
• When a logged-in user is on the “Winner” tab of a Marathon Match, allow all logged in members to be able to select and download winning submissions.

NOTE - anonymous (not logged-in) users should not be able to download.

Clarifications:

• Download should be available for logged-in members, even if they aren't registered for the challenge
• This will only apply to challenges in the Marathon Match challenge type. This challenge type is new and is only in dev. You can see available challenge types by:

GET https://api.topcoder-dev.com/v5/challenge-types

Testing

If you'd like to launch a marathon match for testing, you can do that manually through the challenge API or through the work manager tool at https://challenges.topcoder-dev.com. Sample credentials can be found in the forum.