Add analytics tracking to share buttons [WT-1644]

[stephaniehobson]

One-line summary

Track referral share buttons as widget_action in analytics.

Testing

• Open the referral share page (steps below if you don't already have one locally)
  • Pull down the production database locally
  • Open nightly
  • Turn your VPN to US
  • Pick "Share Nightly" to open the referral page.
  • Change the domain to localhost:8000
• Click each button
• Log the dataLayer in your console and see that there is an event for each one

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.29%. Comparing base (a9c1ad8) to head (b5a3ca4).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1745   +/-   ##
=======================================
  Coverage   88.29%   88.29%           
=======================================
  Files         180      180           
  Lines       12736    12736           
=======================================
  Hits        11245    11245           
  Misses       1491     1491           

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[wen-2018]

Should we track successful copy with writeText().then() instead? Currently, if an icon/a label is missing, the copy action will fail but click will still happen.

[stephaniehobson]

✅