Move the template format to the event name (Google Analytics)

[vgeorge]

Contributes to NASA-IMPACT/nasa-apt#807.

In #563 we added custom events for tracking template downloads by format, but it seems the event parameter template_format is not persisted after some time in the GA dashboard.

In this PR I moved the format to the event name, which should allow tracking download events by format older than 30 mins.

How to test:

• Replace config/local.js with the content of config/staging.js
• Run the app
• Visit http://localhost:9000/new-atbd and download each of the available formats
• Visit GA dashboard
• Go to Reports -> Realtime
• Box 'Event count' by 'Event name' should list the new event names:
  • atbd_template_download_google_docs
  • atbd_template_download_ms_word
  • atbd_template_download_latex

The other reports won't show the events right away because GA doesn't aggregate events for the current day. They should appear after they are older that 1 day.

@wrynearson this is ready for review.

[wrynearson]

This looks almost perfect. The only issue I have is that the Google Sheets template download statistics don't show up in GA.

[vgeorge]

@wrynearson are you referring to the Google Docs template? I tested it now, and the three format types are appearing in the Analytics console:

[wrynearson]

Yes, I was referring to the Google Doc template. Let's push this.

[wrynearson]

@vgeorge was this updated with the Production GA code? cc @sunu

[vgeorge]

@wrynearson the events were appearing in the production panel, we don't need to update the code. The issue was with event parameters, which aren't persisted for more than 30 mins. We should be able to see the updated event names in production.