[OPEN] [Classic Quizzes] Allow only one Question/Question Group editor to be opened

Engineers are currently investigating the issue.
Description
Users can open multiple question and question group editors at the same time. This can lead to confusion and errors since validation is not properly handled.
Expected Behavior
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Only one question or question group editor should be open at a time.
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Clicking edit buttons should submit the active form and consider validation errors.
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The first invalid input should be focused when there are validation errors.
Workaround
No workaround exists at this time.
Steps to Reproduce
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Open the quiz editor.
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Click on the “Edit” icon of a question or question group.
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Click on the “New Question” or “New Question Group” button.
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Observe that multiple editors can be opened without validation checks.
Additional Info
QO-1175
Known issues indicate notable behaviors that have been escalated to the Canvas engineering team. Known issues are not a guarantee for an immediate resolution. This document is for informational purposes only and does not replace the Support process. If you are encountering the behavior outlined in this document, please ensure you have submitted a Support case (per your institution's escalation process) so Canvas Support can adequately gauge the overall customer impact and prioritize appropriately.