fix: Update flaskdb StatefulSet configuration

[asafchen-dig]

This PR addresses the connection issues with the petclinic-flaskdb service by updating the StatefulSet configuration with proper settings:

1. Set replicas to 1 to ensure the database service is running
2. Added resource limits and requests to prevent resource contention:
   • Requests: 256Mi memory, 100m CPU
   • Limits: 512Mi memory, 200m CPU
3. Implemented health checks:
   • Readiness probe: HTTP GET /health on port 5000
   • Liveness probe: HTTP GET /health on port 5000

These changes will ensure:

• The database service is always running with one replica
• Resource usage is properly managed
• Kubernetes can properly monitor container health

Fixes connection issues affecting the /api/clinic-feedback/count endpoint.
Related error: ff76e9d8-81bc-11f0-8462-168ae57aaddf