[#12588] Add unit test to rubric-question-edit-details-form #12907
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Part of #12588
Outline of Solution
Add unit tests to cover uncovered functions: https://app.codecov.io/github/TEAMMATES/teammates/blob/master/src%2Fweb%2Fapp%2Fcomponents%2Fquestion-types%2Fquestion-edit-details-form%2Frubric-question-edit-details-form.component.ts