[base-ui] Remove classes prop from the Base UI components that have it

[hbjORbj]

Breaking Changes

• classes prop is removed from ModalUnstyled, SliderUnstyled, TablePaginationUnstyled and TablePaginationActionsUnstyled.

• You can replace the classes prop by providing the class name prop directly to the prop via slotProps. Below is an example of how the migration should look like:

   <TablePaginationUnstyled
  -   classes={{ toolbar: 'toolbar-classname', menuItem: 'menuItem-classname' }}
  +   slotProps={{ toolbar: { className: 'toolbar-classname' }, menuItem: { className: 'menuItem-classname'}}}
   />

Closes #36129

Changes:

ModalUnstyled, SliderUnstyled, TablePaginationUnstyled and TablePaginationActionsUnstyled still support classes prop. This PR drops the prop from these components.

[mui-bot]

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[michaldudak]

After the change, it's not possible to add custom classes to the Modal (I haven't checked the other components). Could you please take a look at it?

[hbjORbj]

I think this is ready for 2nd review. I'd appreciate it.

[ZeeshanTamboli]

I hope you don't mind the review. Just saw this PR after #35963 (comment).

[michaldudak]

Works much better now. Good job adding the tests!

[michaldudak]

Looks solid!

[mnajdova]

@hbjORbj would be great if you can provide a Breaking changes section in the PR description next time when there is a breaking change involved. This will make the release much faster.

[hbjORbj]

Gottcha. On it.