Ripple: Abstract styles out to be reusable

[benjamincharity]

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We are now overwriting ripple styles manually in multiple places. We should abstract the ripple style control out into a reusable mixin or set of classes.

Used in:

• copy component
• icon button
• ?

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• [ ] Abstract styles out
• [ ] Replace all manually set styles with abstraction
• [ ] Verify all ripples are displayed as expected