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
