fix: send export files event in google analytics v4

[richard015ar]

Issue: pressbooks/pressbooks#3412

Related PR: pressbooks/pressbooks#3428

This PR sends download events using Google Analytics 4.

Testing case

• Ensure you have Google Analytics 4 ID configured correctly:
  • Go to Network Level > Settings > Google Analytics and make sure only 1 Google Analytics field is available to fill/update.
  • Add a Google ID. Ask the team for a test Google Analytics ID, and Google Analytics admin access to watch the real-time events.
• Go to a book page with exported files to be able to download any export from the home page.
• You should be able to watch the download event in real-time events in the Google Analytics admin platform.

[codecov]

Codecov Report

Merging #1175 (f68e738) into dev (d42497c) will not change coverage.
The diff coverage is n/a.

❗ Current head f68e738 differs from pull request most recent head 69c50c5. Consider uploading reports for the commit 69c50c5 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #1175   +/-   ##
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  Coverage   47.56%   47.56%           
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  Files           3        3           
  Lines         574      574           
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  Hits          273      273           
  Misses        301      301           

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[fdalcin]

LGTM. However we're changing the event name from exportFiles to export_files would that impact users? If so, wouldn't it be better to keep the previous name?

[richard015ar]

@fdalcin I think it may impact clients, I will change it.