fix: Add logic to handle grace period breached for paid accounts

[zachaysan]

Changes

Fixes #4513

Handle grace periods for paid accounts will now include the grace period check to see if they've done so in a previous month.

How did you test this code?

Added a check on one existing test and created a new test to handle when grace period has been breached.

[vercel]

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3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)	Visit Preview		Aug 19, 2024 2:16pm
flagsmith-frontend-preview	⬜️ Ignored (Inspect)	Visit Preview		Aug 19, 2024 2:16pm
flagsmith-frontend-staging	⬜️ Ignored (Inspect)	Visit Preview		Aug 19, 2024 2:16pm

[github-actions]

Uffizzi Preview deployment-55351 was deleted.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.92%. Comparing base (7034fa4) to head (9d83904).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4512   +/-   ##
=======================================
  Coverage   96.92%   96.92%           
=======================================
  Files        1178     1178           
  Lines       39489    39512   +23     
=======================================
+ Hits        38275    38298   +23     
  Misses       1214     1214           

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[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-4512	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-4512	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-4512	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-4512	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-4512	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-4512	Finished ✅	Results ✅