feat: implement API key regeneration

[hmacr]

Closes #639

✅ Checklist

• I have followed every step in the contributing guide
• The PR title follows the convention.
• I ran and tested the code works

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Testing

• Verified regenerating the API key for an environment. Ensured it affects only this environment, and the updated API keys are reflected in the Environments & API keys page.
• Verified the error cases when trying to re-generate the API keys.

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Changelog

• Implement resources/environments/$environmentId/regenerate-api-key API.
• Add regenerate button for each environment in the Environments & API keys page.
• Add a modal for user confirmation of API key regeneration.

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Screenshots

Screen.Recording.2023-10-19.at.12.36.49.AM.mp4

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