Flush new UIs for better bot response

[compulim]

Is your feature request related to a problem?

Related to #4846.

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1. Rename to OrgThemeSchema
2. packages/component/src/types/internal/TypeOfArray.ts may not need either T[] or Array<T>
3. packages/component/src/providers/ModalDialog/private/Popover.tsx:L45 may be just onClose={onDismissRef.current}
4. packages/component/src/providers/ModalDialog/ModalDialogComposer.tsx may not need the undefined in args
5. packages/component/src/Styles/StyleSet/ThumbButton.ts:L50 remove commented code
6. Add a tokens.colorForeground for shorthanding to var(--webchat__color--accent)
7. packages/component/src/Styles/StyleSet/ThumbButton.ts remove/rename all var(--pva__*)
8. packages/component/src/ActivityStatus/private/Feedback/Feedback.tsx:L18 remove undefined in args
9. packages/component/src/ActivityStatus/private/Feedback/Feedback.tsx use setSelectedVoteAction directly

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