feat: Update identity override styles

[kyle-ssg]

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• 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?
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Changes

• Removes colour coded styles for identity/segment overrides
• Adds identity/segment override icons next to features that have overrides

How did you test this code?

As above

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Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-5053	Finished ✅	Skipped
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ghcr.io/flagsmith/flagsmith-api:pr-5053	Finished ✅	Results ✅
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ghcr.io/flagsmith/flagsmith-frontend:pr-5053	Finished ✅	Results ✅

[github-actions]

Uffizzi Preview deployment-60390 was deleted.

[matthewelwell]

@kyle-ssg I was suggesting these icons could be used, but perhaps not exactly as they are in the environment UI. For example, the number will always just be 1, right? Also, I think it makes more sense in this context for it to be located nearer to the switch / value?