Too many health check db connections

[pattisdr]

Bug Description

The health check endpoint is creating new engines which are probably creating their own connection pools each time it is called. We should be sharing an engine https://github.com/ethyca/fidesops/blob/main/src/fidesops/ops/api/v1/endpoints/health_endpoints.py#L37

This opens up too many connections against the fidesops database very quickly.

h/t @RobertKeyser and @sanders41 for finding this.

Steps to Reproduce

Bring up the fidesops server and monitor your connections against the fidesops application database.

Expected behavior

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