fix(tailwind): correct disabled tag styles (#7247)
* fix(taggroup): add isDisabled to compoundVariants
this allows the styles defined in isDisabled to be applied
* test(taggroup): add disabled item
this shows the disabled styles in action
* style(taggroup): add dark text colors to improve contrast
* style(taggroup): update dark mode disabled styles
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Co-authored-by: Robert Snow <rsnow@adobe.com>
