feat(tag): add outline variant

[janhassel]

Closes #9670

Added an outline variant for the Tag component.
Background: $background
Outline: $background-inverse
Text: $text-primary
Hover: $layer-hover

Changelog

New

• Added outline variant to tag
• Added cool-gray, warm-gray, high-contrast and outline demos to @carbon/react storybook

Changed

• Updated API snapshot

Testing / Reviewing

Verify visual appearance is as expected

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[sstrubberg]

lgtm!