Split GA4 event product_download into product specific events Fix #14072

[stephaniehobson]

One-line summary

Split GA4 event product_download into product specific conversion events and keep product_download around for a few months to help compare before/after changes.

Significant changes and points to review

• Send two events for each "Product Download": [product name]_download and product_download.
• Update documentation.
• Removed 'mobile' as a platform option. When adjust does not redirect to a specific store, platform is now empty.

Issue / Bugzilla link

Fix #14072
A task to remove the old product_download event has been added to #13238 (I'll flesh it out as a real issue once I have an idea of the timeline to remove it.)

Testing

• firefox_download: http://localhost:8000/en-US/firefox/all/
• firefox_mobile_download: http://localhost:8000/en-US/firefox/browsers/mobile/android/
• focus_download: http://localhost:8000/en-US/firefox/browsers/mobile/focus/
• klar_download: http://localhost:8000/de/firefox/browsers/mobile/focus/
• pocket_download: http://localhost:8000/en-US/firefox/

---

• new events are added to the dataLayer
• old event are still added to the dataLayer
• The documentation updates could really use a fresh set of eyes
• I did not commit my event.preventDefault() I was using for debugging

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (29ddd50) 77.07% compared to head (2bcd1b4) 77.07%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #14083   +/-   ##
=======================================
  Coverage   77.07%   77.07%           
=======================================
  Files         145      145           
  Lines        7886     7886           
=======================================
  Hits         6078     6078           
  Misses       1808     1808           

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[alexgibson]

Both new and old events seems to be logged as expected, r+

(we can hopefully remove all this adjust stuff soon anyways 🤞)