MAINT Extend dtype preserved common test to check transform #24982
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The common test only checks fit_transform. It turns out that the transform method of Isomap does not preserve dtype which was missed in #24714 because of that.
This PR proposes to extend this test to check both methods.
Of course it's currently failing because of Isomap. I'll try to fix it as part of this PR.
Related to #22673