Fix Swinv2ForImageClassification NaN output (#29981)
To address the issue of NaN logit outputs for certain combinations
of the `image_size`, `patch_size` and `depths` configuration
parameters, an assertion was made to ensure that the resulting
`window_size` field in the model's Self Attention class is greater
than 1, preventing divisions by zero in the normalization of
`relative_coords_table`.
Fix: #28675
