This commit fixes four flaky bokchoy tests: test_can_add_remove_allowance, test_can_reset_attempts, test_rescore_nonrescorable and test_timed_exam_flow.

EDUCATOR-949

Fixed 2 of 3 flaky tests

EDUCATOR-949

possible fix for third failing test

Another possible fix for third flaky test

starting tests again

starting tests again

removing flaky decorators

possible fix for fourth flaky test

fixing quality errors

removing flaky decorator from fourth test