fix: Set grace period to a singular event

[zachaysan]

Changes

This sets up a new model to track whether or not a organisation has hit their first grace period and if so further restricts their use of the application.

How did you test this code?

A new unit test.

[vercel]

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3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)	Visit Preview		Aug 6, 2024 6:34pm
flagsmith-frontend-preview	⬜️ Ignored (Inspect)	Visit Preview		Aug 6, 2024 6:34pm
flagsmith-frontend-staging	⬜️ Ignored (Inspect)	Visit Preview		Aug 6, 2024 6:34pm

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-e2e:pr-4455	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api-test:pr-4455	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-4455	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-4455	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-4455	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-4455	Finished ✅	Results ✅

[github-actions]

Uffizzi Preview deployment-55020 was deleted.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.85%. Comparing base (5cbdd7f) to head (5bf7970).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4455   +/-   ##
=======================================
  Coverage   96.85%   96.85%           
=======================================
  Files        1170     1171    +1     
  Lines       38812    38846   +34     
=======================================
+ Hits        37592    37626   +34     
  Misses       1220     1220           

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