Update to Google Analytics 4

[rajadain]

Overview

Upgrades to Google Tag Manager, and also to a Google Analytics 4 property.

We're still using Universal Analytics in development and staging, but the production value is updated to a new GA4 property.

All calls to classic Google Analytics custom events are replaced with GTM Data Layer pushes. This will require corresponding configuration in the GTM account to pick up on the mmw events.

Closes #3581

Testing Instructions

• Check out this branch and run ./scripts/bundle.sh --debug --vendor --tests
• Open the network tab and ensure you've turned off all ad-blockers which may interfere with Google Analytics
• Go to http://localhost:8000/. Draw an area, and move to Analyze
  • Ensure you see one call to www.google-analytics.com/collect
• Update the GOOGLE_ANALYTICS_KEY in

  model-my-watershed/src/mmw/mmw/settings/development.py

  Lines 64 to 65 in aa234a4

  	# azaveadev@azavea.com account
  	GOOGLE_ANALYTICS_ACCOUNT = 'UA-67319750-1'

  and set it to the production value: G-R98FWXKCFY
• Go to http://localhost:8000/. Draw an area, and move to Analyze
  • Ensure you see multiple calls to www.google-analytics.com/collect

[rachelekm]

Success, works great! Confirming I was able to see the GOOGLE_ANALYTICS_ACCOUNT in the first /collect header:

And then had multiple /collect calls with the updated GOOGLE_ANALYTICS_ACCOUNT using the production value:

[rajadain]

Thanks for reviewing!