Add WNP 131 (Fixes #15097)

[alexgibson]

One-line summary

Adds WNP variants for FF 131

Issue / Bugzilla link

#15097

Testing

NA:

• http://localhost:8000/en-US/firefox/131.0/whatsnew/?branch=experiment-wnp-131-tabs&variant=v1 (en-US control)
• http://localhost:8000/en-US/firefox/131.0/whatsnew/?branch=experiment-wnp-131-tabs&variant=v2 (en-US cookie protection)
• http://localhost:8000/en-CA/firefox/131.0/whatsnew/?branch=experiment-wnp-131-tabs&variant=v1 (en-CA control)
• http://localhost:8000/en-CA/firefox/131.0/whatsnew/?branch=experiment-wnp-131-tabs&variant=v2 (en-CA cookie protection)

EU:

• http://localhost:8000/en-GB/firefox/131.0/whatsnew/?branch=experiment-wnp-131-tabs&variant=v1 (en-GB control)
• http://localhost:8000/en-GB/firefox/131.0/whatsnew/?branch=experiment-wnp-131-tabs&variant=v3 (en-GB cookie protection)
• http://localhost:8000/en-GB/firefox/131.0/whatsnew/?branch=experiment-wnp-131-tabs&variant=v4 (en-GB protections dashboard)
• http://localhost:8000/de/firefox/131.0/whatsnew/?branch=experiment-wnp-131-tabs&variant=v1 (DE control)
• http://localhost:8000/de/firefox/131.0/whatsnew/?branch=experiment-wnp-131-tabs&variant=v3 (DE cookie protection)
• http://localhost:8000/de/firefox/131.0/whatsnew/?branch=experiment-wnp-131-tabs&variant=v4 (DE protections dashboard)
• http://localhost:8000/fr/firefox/131.0/whatsnew/?branch=experiment-wnp-131-tabs&variant=v1 (FR control)
• http://localhost:8000/fr/firefox/131.0/whatsnew/?branch=experiment-wnp-131-tabs&variant=v3 (FR cookie protection)
• http://localhost:8000/fr/firefox/131.0/whatsnew/?branch=experiment-wnp-131-tabs&variant=v4 (FR protections dashboard)

[codecov]

Codecov Report

Attention: Patch coverage is 93.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 77.88%. Comparing base (cfb9d21) to head (06c50c4).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
bedrock/firefox/views.py	93.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15176      +/-   ##
==========================================
+ Coverage   77.85%   77.88%   +0.02%     
==========================================
  Files         162      162              
  Lines        8458     8473      +15     
==========================================
+ Hits         6585     6599      +14     
- Misses       1873     1874       +1     

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[craigcook]

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