[CI] Fix partial instability issues

[EmmonsCurse]

1. Add force-kill mechanism for FD_CACHE_QUEUE_PORT and FD_ENGINE_QUEUE_PORT to prevent port conflicts.
2. Add timeout strategy in _unit_test_coverage.yml to avoid hanging CI jobs.
3. Remove redundant log outputs to reduce noise and improve readability.
4. Disable unstable test cases to enhance CI stability.

[paddle-bot]

Thanks for your contribution!