Add database health check in /health endpoint

[nicksome168]

As a developer I need a health endpoint So that I can check if both service and the database are health in the cluster

Details and Assumptions

Acceptance Criteria

 Given a rest API endpoint `/health`
 When user GET `/health` endpoint on cluster
 Then I should expect 200 OK if both services are up. Otherwise 503 Service Unavailable

[yjhsieh2022]

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