🚨🚨🚨 Fix forward of Dinov2ForImageClassification for models with registers (#37836)
* add num_tokens_to_discard to the forward of Dinov2ForImageClassification
* redefine forward in modular file, remove change to modeling_dinov2 file
* run make fixup
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Co-authored-by: Pavel Iakubovskii <qubvel@gmail.com>