fix: default scheduled changes

[tiagoapolo]

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

• I have added information to docs/ if required so people know about the feature!
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• 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

Ref: #4238

• Converts DateSelect and ChangeRequestModal to Typescript
• Adds validation in change/schedule changes

How did you test this code?

Tested all cases manually

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[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-5141	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api:pr-5141	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-e2e:pr-5141	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith:pr-5141	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-5141	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-frontend:pr-5141	Finished ✅	Results ✅

[github-actions]

Uffizzi Ephemeral Environment deployment-61127

☁️ https://app.uffizzi.com/github.com/Flagsmith/flagsmith/pull/5141

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