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feat: include readiness check option (#10850)

## About the changes
This introduces a new endpoint to allow users to check for readiness of
Unleash to serve traffic, in particular validating that the DB is up.
It's an opt-in feature that has to be enabled with the environment
variable `CHECK_DB_ON_READY=true` or via the configuration option
`checkDbOnReady`.

Closes #10742

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