feat: Update identity override styles

[kyle-ssg]

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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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[github-actions]

Uffizzi Ephemeral Environment deployment-60390

☁️ https://app.uffizzi.com/github.com/Flagsmith/flagsmith/pull/5053

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[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?