[HUMAN App] Healthcheck endpoints

[dnechay]

Description

Adding healthcheck functionality to Human App Server

Summary of changes

Added new health endpoints: ping and check with different purpose:

• ping is useful when you want to check that the server is up, running and can be reached via HTTP; it supplies some information about version as well, so you can easily understand what's is deployed w/o having access to CI/infra tools
• check - the main endpoint that provides information about operability and health of dependencies.

Before this PR, application crashed in case of connection errors to Redis and wasn't able to recover until Redis is green. In order to avoid that we have to add error handling to underlying client of cache-manager-redis-store instance with some basic configuration:

• disableOfflineQueue: true is necessary to not make incoming requests "wait" if they rely on Redis and just fail
• throttle error log because otherwise it floods with new message every 500ms
  With this change application will keep serving routes that do not rely on Redis (e.g. profile, sign-in, etc.), which is believed to be better than full outage.

Also removed some unused packages.

How test the changes

To test /health/ping

1. export GIT_HASH=$(git rev-parse HEAD) && yarn start
2. Call the endpoint and check the body

To test /health/check

• run the app with redis server running; call the endpoint and check the result, should be ok
• stop the redis server while app is running; call the endpoint and check the results, should be error

Release notes

In order to enable commit hash for non-local envs we will need to include it to "start" command to include GIT_SHA from RENDER_GIT_COMMIT env variable:

GIT_HASH=$RENDER_GIT_COMMIT yarn start:prod

or put it somehow via env variables config if possible

Related issues

Closes #2646

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