Design issue: patternfly/patternfly-design#1275

Determine what changes are needed to consume tokens in Charts styles:

https://github.com/patternfly/patternfly/blob/v6/src/patternfly/patternfly-charts.scss
https://github.com/patternfly/patternfly/blob/v6/src/patternfly/patternfly-charts-theme-dark-unversioned.scss
https://github.com/patternfly/patternfly/blob/v6/src/patternfly/patternfly-charts-theme-dark.scss