Unquarantine fixed tests

What does this MR do?

Unquarantine fixed tests.

Original issues were:

• https://gitlab.com/gitlab-org/quality/nightly/issues/97
• gitlab-org/quality/staging#46 (closed)

Fixed in: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/28915

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