fix: Create a check for billing started at in API usage task helper

[zachaysan]

Changes

Check when billing_starts_at is None and log it and return from the function.

How did you test this code?

One new test which checks the error behaviour. Existing tests can cover normal operation.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
flagsmith-frontend-preview	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 31, 2024 2:40pm
flagsmith-frontend-staging	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 31, 2024 2:40pm

1 Skipped Deployment

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)			Jul 31, 2024 2:40pm

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-4440	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-4440	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-4440	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-4440	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-4440	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-4440	Finished ✅	Results ✅

[github-actions]

Uffizzi Preview deployment-54861 was deleted.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.85%. Comparing base (f03b479) to head (c6a9024).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4440   +/-   ##
=======================================
  Coverage   96.85%   96.85%           
=======================================
  Files        1170     1170           
  Lines       38786    38801   +15     
=======================================
+ Hits        37566    37581   +15     
  Misses       1220     1220           

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[novakzaballa]

LGTM