fix: send export files event in google analytics v4

[richard015ar]

Issue: https://github.com/pressbooks/pressbooks/issues/3412

Related PR: https://github.com/pressbooks/pressbooks/pull/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[bot]]

Codecov Report

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

:exclamation: 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

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[richard015ar]

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