[Pipeline Refactor][Server] Enable from files for v2

[dsikka]

Summary

• Temporarily disabled from_files when migrating the server as our previous solution involved checking the schema for the pipeline. This no longer works as an operator doesn't have to have an input schema
• Provided a temporary solution as lower priority but wanted to unblock QA. As we migrate more pipelines, we can work on a slightly more sophisticated solution but for now, only image_classification has been migrated which also uses v2 and supportsfrom_files

Testing

• All server tests pass

Tested locally

deepsparse.server \
    task image_classification \
    --model_path "zoo:cv/classification/resnet_v1-50/pytorch/sparseml/imagenet/pruned95-none" \
    --port 5543