feat(api usage): Extra Flagsmith checks for API overage charges

[zachaysan]

Changes

This is a simple change to introduce another Flagsmith feature check for one of the more dangerous tasks that we have in the API usage alerting code.

How did you test this code?

The change also fixes a number of tests that broke with the change and introduces a large test for checking whether the Flagsmith client will successfully guard against non-use when disabled.

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3 Ignored Deployments

| Name | Status | Preview | Comments | Updated (UTC) | | :--- | :----- | :------ | :------- | :------ | | **docs** | ⬜️ Ignored ([Inspect](https://vercel.com/flagsmith/docs/AEppfG9GV2qhWTEZGGfrg25Kk4rh)) | | | Jun 26, 2024 3:39pm | | **flagsmith-frontend-preview** | ⬜️ Ignored ([Inspect](https://vercel.com/flagsmith/flagsmith-frontend-preview/7HtzEv8JFi94mmz9AGxV2ED52gKM)) | | | Jun 26, 2024 3:39pm | | **flagsmith-frontend-staging** | ⬜️ Ignored ([Inspect](https://vercel.com/flagsmith/flagsmith-frontend-staging/4ksW5Lciz3PSujJxkJVuog7VfPMz)) | | | Jun 26, 2024 3:39pm |

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Uffizzi Preview deployment-53537 was deleted.

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 96.57%. Comparing base (182ea04) to head (fef930f). Report is 3 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #4251 +/- ## ======================================= Coverage 96.57% 96.57% ======================================= Files 1190 1190 Lines 38754 38804 +50 ======================================= + Hits 37426 37476 +50 Misses 1328 1328 ```

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