[system] Merge props and ownerState in the variants props callback

[mnajdova]

Fixes #41220

Consolidate the arguments for the variants' props callback between the @mui/system and the zero-runtime. The argument is now merging props and ownerState, so that developers can do:

variants: [{
  props: (props) => props.someState === 'some-value'
}]

instead of needing to do:

variants: [{
  props: (props) => props.ownerState.someState === 'some-value'
}]

Zero-runtime related code: https://github.com/mui/material-ui/blob/master/packages/zero-runtime/src/styled.jsx#L9

[mui-bot]

Netlify deploy preview

https://deploy-preview-41219--material-ui.netlify.app/

Bundle size report

No bundle size changes (Toolpad)
No bundle size changes

Generated by 🚫 dangerJS against 2adb748

[brijeshb42]

Thanks