[VLM] Update compatibility with transformers 4.49

[DarkLight1337]

• Set patch_size in E5-V processor to work with the current transformers v4.48
• Update Pixtral-HF processor to remain compatible with the change in Pixtral: vectorize patch embeddings and enable tests huggingface/transformers#35122
• Remove Pixtral-HF chat template as HF Hub has been updated with the correct chat template already cc @mgoin
• Update MiniCPM-V and MiniCPM-o processors to remain compatible with the change in transformers.image_transforms.normalize wrong types huggingface/transformers#35773 cc @HwwwwwwwH

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[mgoin]

LGTM thank you!

[mgoin]

This is annoying, but necessary. I see how this works now compared to the HF implementation. It is unfortunately we now have this fragmentation with the HF PixtralPreTrainedModel