Describe the bug
This is an issue with the autograding results, documentation here:
https://submitty.org/instructor/autograding/hidden_testcase_examples

the release_hidden_details flag is buggy

But the students cannot see the details. There is a "Show Details" button, but it doesn't actually show anything when clicked.

Expected behavior
After the gradeable is released, the instructor can see the results of the hidden tests from the submission page (if the instructor makes a submission for themselves to the gradeable). The student should also have this behavior. Something must be wrong with the logic -- I didn't see the bug when I quickly skimmed at the code...

To Reproduce

the more_autograding_examples/cpp_hidden_test has hidden tests. The gradeable should be modified to add this flag on one of the tests. We should write autograding(?) cypress tests of the visibility of these details after grades are released -- both for instructor & student users.