feat: add environment processing UI

[kyle-ssg]

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

• 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

Shows the following UI whilst an environment is creating

Adds types to environment creation

How did you test this code?

Created environments, they show the processing UI and then the features page once is_creating is false.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
flagsmith-frontend-preview	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 6, 2024 0:07am
flagsmith-frontend-staging	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 6, 2024 0:07am

1 Skipped Deployment

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)	Visit Preview		Nov 6, 2024 0:07am

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-e2e:pr-4812	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api-test:pr-4812	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api:pr-4812	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-4812	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-4812	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-4812	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-4812	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-frontend:pr-4812	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-frontend:pr-4812	Finished ✅	Results ✅

[github-actions]

Uffizzi Preview deployment-58015 was deleted.

[matthewelwell]

Reviewed code and tested manually. All looks good to me.

[sentry-io]

Suspect Issues

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

• ‼️ TypeError: Cannot destructure property 'store' of 't(...)' as it is null. exports.exports(web/components/EnvironmentReady... View Issue
• ‼️ TypeError: D is undefined children(web/components/pages/EnvironmentSettin... View Issue
• ‼️ TypeError: Cannot read properties of null (reading 'prevent_flag_defaults') children(web/components/pages/ProjectSettingsPage) View Issue
• ‼️ TypeError: Cannot destructure property 'store' of 't(...)' as it is null. exports.exports(web/components/EnvironmentReady... View Issue
• ‼️ TypeError: Cannot read properties of null (reading 'prevent_flag_defaults') children(web/components/pages/ProjectSettingsPage) View Issue

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