[material-ui][Button] Deprecate classes for v6

[sai6855]

part of #40417

(Button doesn't have components, componentsProps, *COmponent, *Props) so i think button can be marked as done in original issue, once this is merged)

preview: https://deploy-preview-40675--material-ui.netlify.app/material-ui/api/button/#classes

• [x] I have followed (at least) the PR section of the contributing guide.

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[DiegoAndai]

Hey @sai6855! I'm aware of this PR, but we're discussing whether prop default values should have classes: https://github.com/mui/material-ui/issues/40733. Please leave your opinion there if you have one 😊.

So I'll put this on hold until we make a decision. I'll push so we move fast on it.

[sai6855]

Got it!! thanks for the update

[sai6855]

@DiegoAndai since option 1 is choosen for above RFC, I'm assuming no change is required in this PR

[DiegoAndai]

@sai6855 correct! No change is required.

We'll keep this PR on hold for a little longer as per this comment: https://github.com/mui/material-ui/issues/40417#issuecomment-1905969569

[DiegoAndai]

Hey @sai6855, we're now unblocked: https://github.com/mui/material-ui/issues/40417#issuecomment-1946344627