Track product click events in glean.js

[alexgibson]

One-line summary

• Updates to Glean.js v5.0.1.
• Removes older custom click event and switches to the new standardized Glean event.
• Tracks click events for Firefox and VPN CTA links.

Significant changes and points to review

Glean is only enabled on dev right now, so this should be safe to test out.

Issue / Bugzilla link

N/A

Testing

• make preflight
• npm start
• Set window.Glean.setLogPings(true) in the web console and refresh the page to view raw ping logs as you click element in a page.
• You might also want to enable Persist Logs in web console settings.

URLs

• http://localhost:8000/en-US/firefox/new/
• http://localhost:8000/en-US/firefox/channel/desktop/
• http://localhost:8000/en-US/firefox/browsers/mobile/ios/ (send to device)
• http://localhost:8000/en-US/products/vpn/
• http://localhost:8000/en-US/products/vpn/pricing/
• http://localhost:8000/en-US/products/vpn/invite/
• http://localhost:8000/en-US/ (newsletter)

[alexgibson]

@stephaniehobson I'm going to set this one back to draft until the consent banner PR has merged. Will revisit, thanks.

[alexgibson]

@stephaniehobson this is now rebased and ready for review, thanks.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.87%. Comparing base (17adeb7) to head (d22e015).

❗ Current head d22e015 differs from pull request most recent head 71125e4

Please upload reports for the commit 71125e4 to get more accurate results.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #14416      +/-   ##
==========================================
- Coverage   76.94%   76.87%   -0.07%     
==========================================
  Files         157      156       -1     
  Lines        8192     8157      -35     
==========================================
- Hits         6303     6271      -32     
+ Misses       1889     1886       -3     

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