infra: add production environment variables for FoF and API usage alerting

[matthewelwell]

Changes

Adds 4 new environment variables to the task processor task definition in production. 3 of these are related to enabling Flagsmith on Flagsmith and 1 is related directly to enabling API usage alerting.

Note that I have created the secret in AWS secrets manager already.

How did you test this code?

These variables have all been tested in staging.

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3 Ignored Deployments

| Name | Status | Preview | Comments | Updated (UTC) | | :--- | :----- | :------ | :------- | :------ | | **docs** | ⬜️ Ignored ([Inspect](https://vercel.com/flagsmith/docs/64gGJYWqVLa2mSii2YwuKDU5M4kw)) | [Visit Preview](https://docs-git-infra-add-environment-variables-for-a-117656-flagsmith.vercel.app) | | Jun 26, 2024 1:56pm | | **flagsmith-frontend-preview** | ⬜️ Ignored ([Inspect](https://vercel.com/flagsmith/flagsmith-frontend-preview/rS2yuJ85igqN89Sg237NHVJ5retX)) | [Visit Preview](https://flagsmith-frontend-preview-git-infra-add-envir-e37192-flagsmith.vercel.app) | | Jun 26, 2024 1:56pm | | **flagsmith-frontend-staging** | ⬜️ Ignored ([Inspect](https://vercel.com/flagsmith/flagsmith-frontend-staging/4sANLZ4y11bXGrWUuHzNg4zKxzyd)) | [Visit Preview](https://flagsmith-frontend-staging-git-infra-add-envir-69bfc5-flagsmith.vercel.app) | | Jun 26, 2024 1:56pm |

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