chore: Remove user api keys

[kyle-ssg]

Thanks for submitting a PR! Please check the boxes below:

• [x] I have added information to docs/ if required so people know about the feature!
• [x] I have filled in the "Changes" section below?
• [x] I have filled in the "How did you test this code" section below?
• [x] I have used a Conventional Commit title for this Pull Request

Changes

Removes the API key tab in user settings

[vercel[bot]]

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Name	Status	Preview	Comments	Updated (UTC)
flagsmith-frontend-preview	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 23, 2024 11:18am
flagsmith-frontend-staging	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 23, 2024 11:18am

1 Skipped Deployment

| Name | Status | Preview | Comments | Updated (UTC) | | :--- | :----- | :------ | :------- | :------ | | **docs** | ⬜️ Ignored ([Inspect](https://vercel.com/flagsmith/docs/EJuAcpo4tgnnosCoYDwQngTQuf56)) | | | Sep 23, 2024 11:18am |

[github-actions[bot]]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-4652	Finished :white_check_mark:	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-4652	Finished :white_check_mark:	Skipped
ghcr.io/flagsmith/flagsmith-api:pr-4652	Finished :white_check_mark:	Results :white_check_mark:
ghcr.io/flagsmith/flagsmith-frontend:pr-4652	Finished :white_check_mark:	Results :white_check_mark:
ghcr.io/flagsmith/flagsmith:pr-4652	Finished :white_check_mark:	Results :white_check_mark:
ghcr.io/flagsmith/flagsmith-private-cloud:pr-4652	Finished :white_check_mark:	Results :white_check_mark:

[github-actions[bot]]

Uffizzi Preview deployment-56538 was deleted.

[kyle-ssg]

Closing for now since it's not strictly required