CloseButtonProps size type conflicts with inherited ButtonProps type

[bmansell]

CloseButton uses its size prop to control the Close icon's size. This is a problem because CloseButtonProps extends ButtonProps which defines size as a specific string set so the resulting type is a mix of specific strings or a number.

design-system/packages/types/types/index.d.ts

Line 73 in aede4ea

size?: 'small' | 'medium' | 'large' | number

We should refactor CloseButton's size prop to be more specific like iconSize so that these types don't have to be collapsed into one.

[craigpalermo]

Discussion notes: We can rename size for Icon in IconButton to iconSize, which will be the same prop type as size on the Icon component.