fix: add logic to handle subscriptions in trial

[matthewelwell]

Changes

API component for #604

This PR handles the subscription status "in_trial". When the trial switches to "active", "non_renewing" or "cancelled", the rest of the logic / tests should cover that behaviour.

How did you test this code?

Updated existing unit test.

[vercel]

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3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)			Jul 29, 2024 9:47am
flagsmith-frontend-preview	⬜️ Ignored (Inspect)			Jul 29, 2024 9:47am
flagsmith-frontend-staging	⬜️ Ignored (Inspect)			Jul 29, 2024 9:47am

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-e2e:pr-4404	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api-test:pr-4404	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-4404	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-4404	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-4404	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-4404	Finished ✅	Results ✅

[github-actions]

Uffizzi Preview deployment-54733 was deleted.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.84%. Comparing base (114d0c3) to head (69b663c).
Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4404   +/-   ##
=======================================
  Coverage   96.84%   96.84%           
=======================================
  Files        1166     1166           
  Lines       38675    38676    +1     
=======================================
+ Hits        37453    37454    +1     
  Misses       1222     1222           

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