Quarantine flaky specs

What does this MR do?

Quarantine flaky specs

Related to:

• https://gitlab.com/gitlab-org/gitlab-ce/issues/60270
• https://gitlab.com/gitlab-org/gitlab-ce/issues/60271
• https://gitlab.com/gitlab-org/gitlab-ce/issues/60272
• https://gitlab.com/gitlab-org/gitlab-ce/issues/60273

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry
• [-] Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Performance and testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers