feat: Improve API key UX

[kyle-ssg]

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

Changes

• Autofocus name field for api key
• Show the following after created
  
• Show the following on close
  

How did you test this code?

Please describe.

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Name	Status	Preview	Comments	Updated (UTC)
docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 4, 2024 11:56am
flagsmith-frontend-preview	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 4, 2024 11:56am
flagsmith-frontend-staging	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 4, 2024 11:56am

[github-actions]

Uffizzi Preview deployment-52615 was deleted.

[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ TypeError: Cannot read properties of null (reading 'focus') apply(web/components/AdminAPIKeys) View Issue

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