style(tooltip): Move rich tooltip text color theme mixin out of the rich tooltip class styling so the colors can be overriden.
style(tooltip): Move rich tooltip text color theme mixin out of the rich tooltip class styling so the colors can be overriden.

PiperOrigin-RevId: 354113124

material-components/material-components-web,material-components/material-components-web,material-components/material-components-web