Rollback merge request (208741) (Fix Tool Coverage data update when all projects are archived)

Problem

MR !208741 (merged) introduced a UNION ALL clause to fix Tool Coverage statistics when all projects are archived. However, this change caused:

• Query timeouts in production
• Significant performance degradation

Action Required

• Immediate: Revert MR !208741 (merged) via MR !209643 (merged) to restore performance
• Follow-up: Develop alternative solution to fix the original archived projects bug without performance impact - Tool Coverage data not updated when archiving l... (#572794) • Nicolae Rotaru • 18.6 has been re-opened for the follow-up

Impact

• Priority: Production stability over edge case bug fix
• Trade-off: Reintroduces original issue where Tool Coverage stats aren't reset when all projects archived
• Timeline: Rollback needed urgently to prevent continued timeouts