Add tests for new 2024.12 functionality

[asmeurer]

This is a tracking issue for testing new 2024.12 functionality.

There isn't a changelog yet, but the new functionality that I'm aware of is:

New functions

• [ ] diff
• [ ] nextafter
• [ ] reciprocal
• [ ] take_along_axis

New Functionality

• [ ] The 'max dimensions' key of __array_namespace_info__().capabilities() (note that capabilities itself is not yet tested at all, see https://github.com/data-apis/array-api-tests/issues/249)
• [ ] Scalar support in most functions (note that at the time of writing this isn't yet written up in the standard)

[ev-br]

cross-ref https://github.com/data-apis/array-api-tests/pull/324 for testing reciprocal.