EOY Donate Banner (Fix #15711)

[stephaniehobson]

One-line summary

Update fundraising banner for EOY campaign.

• I tried to use an AI to write some of this code and it failed miserably so I didn't use the output at all.

Significant changes and points to review

• 3 variants in 8 languages
• a DNT/GCP compliant fallback

Issue / Bugzilla link

Fix #15711

Testing

• disabling the switch fundraising-banner-2024eoy removes the banner and brings the pencil banner back
• disabling the switch show-pencil-banner hides the pencil banner
• the fundraising banner can be enabled with the pencil banner disabled
• experiment does not load with GCP enabled (test in Brave browser, it's enabled by default)

Has banner:

• http://localhost:8000/en-US/?v=a
• http://localhost:8000/en-US/?v=b
• http://localhost:8000/en-US/?v=c
• http://localhost:8000/fr/?v=a
• http://localhost:8000/fr/?v=b
• http://localhost:8000/fr/?v=c
• http://localhost:8000/de/?v=a
• http://localhost:8000/de/?v=b
• http://localhost:8000/de/?v=c
• http://localhost:8000/es-ES/?v=a
• http://localhost:8000/es-ES/?v=b
• http://localhost:8000/es-ES/?v=c
• http://localhost:8000/it/?v=a
• http://localhost:8000/it/?v=b
• http://localhost:8000/it/?v=c
• http://localhost:8000/pl/?v=a
• http://localhost:8000/pl/?v=b
• http://localhost:8000/pl/?v=c
• http://localhost:8000/pt-BR/?v=a
• http://localhost:8000/pt-BR/?v=b
• http://localhost:8000/pt-BR/?v=c
• http://localhost:8000/en-GB/?v=a
• http://localhost:8000/en-GB/?v=b
• http://localhost:8000/en-GB/?v=c

Does not have banner:

http://localhost:8000/ms/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.06%. Comparing base (0fa03eb) to head (d94b126).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #15720   +/-   ##
=======================================
  Coverage   79.06%   79.06%           
=======================================
  Files         160      160           
  Lines        8355     8355           
=======================================
  Hits         6606     6606           
  Misses       1749     1749           

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[craigcook]

LGTM. One minor nitpick: the headline sometimes runs into the close button at some mobile sizes, but it's a bit of an edge case. Could add some padding to the headline to preserve space on mobile.

r+wc 🍌