[chore]: Stop using `shouldForwardProp` and just use `$` for simplicity

[joshuaellis]

What's Wrong?

We're using shouldForwardProp which whilst it isn't incorrect, the simple recommended approach for handling props being incorrectly passed to the DOM is to use the $ symbole – https://styled-components.com/docs/api#transient-props

[joshuaellis]

Update – this will be required to update to styled-components@6

[joshuaellis]

solved by #1695