Quarantine flaky tests

What does this MR do?

Quarantine currently failing/flaky tests.

What are the relevant issue numbers?

• gitlab-org/quality/nightly#70
• gitlab-org/quality/nightly#72
• gitlab-org/quality/staging#21 (closed)
• gitlab-org/quality/staging#31 (closed)
• gitlab-org/quality/staging#30 (closed)
• gitlab-org/quality/staging#26 (closed)

Does this MR meet the acceptance criteria?

• [-] Changelog entry added, if necessary
• [-] Documentation created/updated via this MR
• [-] Documentation reviewed by technical writer or follow-up review issue created
• [-] Tests added for this feature/bug
• [-] Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• [-] Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
• [-] Security reports checked/validated by reviewer