Quarantine download MR patch and diff test suite

What does this MR do?

Quarantine transient failing test: gitlab-org/quality/staging#55 (closed)

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