fix(ui-react-storage): StorageImage showing fallback text while the image is still fetching

[aadimch]

Description of changes

Currently, when using StorageImage, the user would see the fallback text while the image is still being fetched. The issue is more prominent when the network is throttled.

This PR uses the loading state exposed by useGetUrl and returns a View with the provided styles while the image is being fetched.

Issue #6254

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Latest commit: ca575e7

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[calebpollman]

For future reference, no need to spread style and create a new object here

[calebpollman]

Rather than destructure style, let's add a loadingElement key on StorageImageProps and render it conditionally while isLoading is true if provided.

interface StorageImageProps {
  loadingElement?: React.ReactNode;
}

[aadimch]

Closed in favor of #6448