UA: Enable downsells for yearly subscriptions

[jpmartinspt]

Done

Enable downsells for yearly subscriptions

QA

• Check out this feature branch
• Run the site using the command ./run serve or dotrun
• View the site locally in your web browser at: http://0.0.0.0:8001/
• Go to one of your early subscriptions and attempt to downsize the number of machines

[webteam-app]

Demo starting at https://ubuntu-com-11976.demos.haus

[codecov-commenter]

Codecov Report

Merging #11976 (f3af2f2) into main (8120692) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main   #11976   +/-   ##
=======================================
  Coverage   64.15%   64.15%           
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  Files         119      119           
  Lines        2636     2636           
  Branches      773      773           
=======================================
  Hits         1691     1691           
  Misses        903      903           
  Partials       42       42