Replace pytest tests with comprehensive service health checks

- Comment out all pytest-related steps (Pull Test Image, Verify API,
  Create Test Reports, Load Test Data, Run pytest, Upload Reports,
  Display Test Results)
- Add comprehensive health check step that verifies:
  - All containers are running (api, celery workers, redis, mongodb, elasticsearch)
  - API server endpoints (/, /api/jobs, /docs, /openapi.json)
  - Elasticsearch cluster health and index status
  - Redis connectivity (PING/PONG)
  - MongoDB connectivity (ping command)
  - Celery workers status
- Add final deployment status display with all service endpoints
- Pytest sections preserved as comments for future re-enablement

Author: johnnynv