Remove count for pending/running/finished pipelines in tabs

What does this MR do?

• Removes count for pending,running and finished pipelines in tabs
• Redirects to a filter with that status instead if trying to access it from the URL.

This is the backend part of #219276 (closed)

Screenshots

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides