Shortcuts WNP135 (#15852)

[maureenlholland]

If this changeset needs to go into the FXC codebase, please add the WMO and FXC label.
⚠️ not sure if the WNP pages are moving to FXC yet, but it's relevant to FXC

One-line summary

UK/DE/FR should see Shortcuts-based WNP

Note: UK is geographically specified because the US and Canada will get a PDF-based WNP

Significant changes and points to review

Issue / Bugzilla link

#15852

Testing

Figma [Mozilla only]
Copy [Mozilla only]

• Shows for en locale and GB country: http://localhost:8000/en-US/firefox/135.0/whatsnew/?geo=GB
• Uses default for non-en locale and GB country: http://localhost:8000/es-ES/firefox/135.0/whatsnew/?geo=GB
• Use default for en locale not in GB country: http://localhost:8000/en-US/firefox/135.0/whatsnew/?geo=US
• Shows for fr locale: http://localhost:8000/fr/firefox/135.0/whatsnew/
• Shows for de locale: http://localhost:8000/de/firefox/135.0/whatsnew/
• Works in Dark and Light mode

UPDATE

• Shows for en-GB locale, regardless of country: http://localhost:8000/en-GB/firefox/135.0/whatsnew/
• Uses default other locales: http://localhost:8000/es-ES/firefox/135.0/whatsnew/?geo=GB

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.29%. Comparing base (f13a56d) to head (c4c23da).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #15903   +/-   ##
=======================================
  Coverage   79.28%   79.29%           
=======================================
  Files         159      159           
  Lines        8343     8347    +4     
=======================================
+ Hits         6615     6619    +4     
  Misses       1728     1728           

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[alexgibson]

r+ nice work 🍡 (I'll leave it to you to merge when you're ready)