Implement health check endpoint (`/api/health`) that checks Cromwell connectivity and Mongo connectivity in real time

[eecavanna]

This task is to implement an API endpoint on the web app server (i.e. Node.js application) that, when accessed, does the following:

• Performs a GET request to the Cromwell API
• Queries the Mongo database
• Returns an object that looks like this (if both of the above are successful):

  {
  "cromwell": true,
  "mongo": true,
  }