feat: Tweak email wording for grace periods

[zachaysan]

Changes

Adds in a grace period check on the language around API usage notifications.

How did you test this code?

Altered an existing test.

[vercel]

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3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)			Aug 12, 2024 6:51pm
flagsmith-frontend-preview	⬜️ Ignored (Inspect)			Aug 12, 2024 6:51pm
flagsmith-frontend-staging	⬜️ Ignored (Inspect)			Aug 12, 2024 6:51pm

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-frontend:pr-4482	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api-test:pr-4482	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-4482	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api:pr-4482	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-4482	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-4482	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-frontend:pr-4482	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-4482	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-4482	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-4482	Finished ✅	Results ✅

[github-actions]

Uffizzi Preview deployment-55180 was deleted.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.91%. Comparing base (6660af5) to head (0dd3322).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4482   +/-   ##
=======================================
  Coverage   96.91%   96.91%           
=======================================
  Files        1176     1176           
  Lines       39348    39348           
=======================================
  Hits        38134    38134           
  Misses       1214     1214           

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