[$100] Add health check to UI project

[jmgasper]

As discussed via Slack, for both develop and master.

[jmgasper]

Contest https://www.topcoder.com/challenges/30103807 has been created for this ticket.

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[jmgasper]

Contest https://www.topcoder.com/challenges/30103807 has been updated - it has been assigned to thomaskranitsas.

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[jmgasper]

@ThomasKranitsas - Can you check this please? It's not working in prod:

https://x.topcoder.com/health

And relevant logs:

2019-10-02T06:03:45.912966+00:00 heroku[router]: at=info method=GET path="/health" host=x.topcoder.com request_id=7efdea5a-7265-4d71-98a3-cbc103e03b21 fwd="86.205.119.1" dyno=web.1 connect=1ms service=3ms status=301 bytes=475 protocol=https
2019-10-02T06:03:46.033946+00:00 app[web.1]: Error: Can't set headers after they are sent.
2019-10-02T06:03:46.033961+00:00 app[web.1]: at SendStream.headersAlreadySent (/app/node_modules/send/index.js:402:13)
2019-10-02T06:03:46.033963+00:00 app[web.1]: at SendStream.send (/app/node_modules/send/index.js:625:10)
2019-10-02T06:03:46.033965+00:00 app[web.1]: at /app/node_modules/send/index.js:782:12
2019-10-02T06:03:46.033966+00:00 app[web.1]: at FSReqWrap.oncomplete (fs.js:153:5)

[ThomasKranitsas]

New PRs:

• Fix health check endpoint #195
• Fix health check endpoint #196

[jmgasper]

Payment task has been updated: https://software.topcoder.com/review/actions/ViewProjectDetails?pid=30103807

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