♻️(react) update Button component props and refactor related components

This commit modifies the Button component to switch the `variant` and
`color` props, ensuring consistency across various components that
utilize the Button. The changes include updates in the Alert, Modal,
Tooltip, and other components to reflect this new prop structure.
Additionally, several test and story files have been adjusted to
accommodate these changes, enhancing the overall component architecture.

packages/react/src/components/Modal/index.tsx

@@ -99,8 +99,8 @@ export const ModalInner = ({ closeOnEsc = true, ...props }: ModalProps) => {
           <div className="c__modal__close">
             <Button
               icon={<span className="material-icons">close</span>}
-              color="tertiary"
-              variant="neutral"
+              variant="tertiary"
+              color="neutral"
               size="small"
               onClick={props.onClose}
             />