feat: combine value + segment change requests for versioned environments

[kyle-ssg]

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• 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

This allows segment and environment changes to be created under 1 change requests for versioned environments.

How did you test this code?

Created change requests changing both the value and the segment overrides and individually.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
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[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-4738	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-4738	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api:pr-4738	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-4738	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-4738	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-frontend:pr-4738	Finished ✅	Results ✅

[github-actions]

Uffizzi Ephemeral Environment deployment-57310

☁️ https://app.uffizzi.com/github.com/Flagsmith/flagsmith/pull/4738

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