[material-ui][Box] Remove component from BoxOwnProps

[DiegoAndai]

Fixes #34068

When this was implemented initially (#38168), an error was reported (#38274), which prompted it to be reverted.

The issue was with styled(Box), but since then, we've added the no-styled-box rule, so instead of the proposed workaround I added the following diff to the upgrade guide:

-const StyledBox = styled(Box)`
+const StyledDiv = styled('div')`
   color: white;
 `;

I also added the type cast, just in case.

[mui-bot]

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• docs/data/material/migration/upgrade-to-v6/upgrade-to-v6.md

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[aarongarciah]

✅ very nice