Adds a simple healthcheck endpoint for the concepts service #749
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What does this change?
This change follows #747, and adds an HTTP healthcheck to the requests API to ensure the Scala service has started before it is registered healthy at the NLB and starts serving requests.
How to test?
How can we measure success?
No downtime during deployments resulting in a better experience for visitors to the site, and fewer errors that we cannot effectively respond to in the alerts channel.