fix: Handle cancellation date for api usage

[zachaysan]

Changes

Two small updates to the API usage alerting code that checks for subscription being cancelled and treating them as free accounts.

How did you test this code?

Two new tests.

[vercel]

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3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)			Sep 30, 2024 3:52pm
flagsmith-frontend-preview	⬜️ Ignored (Inspect)			Sep 30, 2024 3:52pm
flagsmith-frontend-staging	⬜️ Ignored (Inspect)			Sep 30, 2024 3:52pm

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-e2e:pr-4672	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api-test:pr-4672	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-4672	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-4672	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-4672	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-4672	Finished ✅	Results ✅

[khvn26]

Looks good.

[github-actions]

Uffizzi Preview deployment-56756 was deleted.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.19%. Comparing base (dd1dd32) to head (93e8709).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4672   +/-   ##
=======================================
  Coverage   97.18%   97.19%           
=======================================
  Files        1166     1166           
  Lines       40369    40400   +31     
=======================================
+ Hits        39234    39265   +31     
  Misses       1135     1135           

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