Added type-specific error message to cross_validate function #1799
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Bug Fix Pull Request
Description
Fixes #1773, giving a more verbose error message when the cross_validate function receives an incorrect input.
How Has This Been Tested?
Running cross_validate with expected and unexpected types.
Steps to Reproduce (original bug)
Run skrub.cross_validate with a data_op type as input rather than a learner.
Additional Notes