v2 => Refactor tests for mixed deployment environment new pipeline deployment approach

Summary

Quarantine UI login test for refactored mixed-deployment environment setup

Improvements

Removes login UI tests to eliminate noisy behavior while refactoring for new approach to pipeline deployment with staging-canary

Involved components

QE login UI test for MDE (mixed deployment environment)

Tasks

• Isolate MDE tests to prevent test leakage into other jobs (due to pipeline-common architecture)
• Alter selection strategy based on needs from deployment pipeline reordering work
• Limit to staging env
• Relocate and retag test for mixed deployment refactor | MR: !73297 (closed)