E2E test operations dashboard

What does this MR do?

New E2E test for multiple pipelines in Operations Dashboard showing correct statuses accordingly

Test case gitlab-org/quality/testcases#145 (closed)

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• Separation of EE specific content