Run a test on all submissions for a project

Describe your feature request
If a unit test or I/O test is defined for a project, it would be great if there was a way to run said test for all projects submissions.

What problem(s) would this feature solve?
This would minimize the amount of time spent clicking through individual projects, so all submissions can be graded at once.

Explain what you were trying to do when you came across the problem leading to this feature request
I was trying to grade an assignment, which is relatively simple to program, but it was taking quite a while to go through all of the assignments individually and running the I/O test for every single project, and this feature would really improve efficiency of grading.

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