skipSx should update shouldForwardProps

Duplicates

• I have searched the existing issues

Latest version

• I have tested the latest version

Summary 💡

The skipSx doesn't work as expected when shouldForwardProp default mechanism is overwritten and does not include 'sx' directly

shouldForwardProp: (prop) => !["isEven"].includes(prop as string),
skipSx: true

This will send sx to the underlying component

Examples 🌈

I made a code sandbox using the latest released material

https://codesandbox.io/s/goofy-phoebe-xc99x

Motivation 🔦

making a custom component that only changes in CSS layer duo to props is a common practice
also, sx seems to be a little bit slow, and skipping it may gain some performance tips

so because we are working mostly with the Mui component and they pass the props to the underling dom node, it makes sense to have it as a core feature of the material

I seared on skipSx tags in the issue list and could not find an open issue, so posted a new one.

Start with the linked CodeSandbox reproduction and trace the implementation of skipSx together with the default shouldForwardProp behavior. Confirm the fix by checking that sx is not passed to the underlying component when a custom shouldForwardProp omits it.