Quarantine group::editorextensions flaky spec
What does this MR do and why?
This is part of Flaky Test Intervention - part 1 (&19643) .
In this MR, we are to quarantine groupeditor extensions flaky specs as reported in https://gitlab.com/gitlab-org/gitlab/-/issues?sort=created_date&state=opened&label_name%5B%5D=failure%3A%3Aflaky-test&label_name%5B%5D=group%3A%3Aeditor%20extensions¬%5Blabel_name%5D%5B%5D=quarantine&first_page_size=100
groupeditor extensions is responsible for fixing these specs before unquarantining them or remove them if they are no longer valid.
References
Related to #539416 (closed)
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