Create `Button` migrations

[aveline]

• rename primary prop to variant="primary"
• rename plain prop to variant="plain"
• rename primary plain props to variant="tertiary"
• rename plain monochrome to variant="monochromePlain"
• rename destructive prop to tone="critical" variant="primary"
• rename outline destructive props to tone="critical"
• remove outline prop
• remove outline monochrome prop
• remove monochrome prop
• handle props in object in buttonFrom function
• Update migration guide