Update NNCF Dataloader in Anomaly Task

[ashwinvaidya17]

Summary

• Replicate changes in Update nncf export anomalib#2286 as it leads to higher performance.

How to test

Checklist

• I have added unit tests to cover my changes.​
• I have added integration tests to cover my changes.​
• I have ran e2e tests and there is no issues.
• I have added the description of my changes into CHANGELOG in my target branch (e.g., CHANGELOG in develop).​
• I have updated the documentation in my target branch accordingly (e.g., documentation in develop).
• I have linked related issues.

License

• I submit my code changes under the same Apache License that covers the project.
  Feel free to contact the maintainers if that's a concern.
• I have updated the license header for each file (see an example below).

# Copyright (C) 2024 Intel Corporation
# SPDX-License-Identifier: Apache-2.0

[harimkang]

I have a question, don't some of the models in the anomaly task have no validation, and in certain cases do use them without validation data?

[ashwinvaidya17]

I have a question, don't some of the models in the anomaly task have no validation, and in certain cases do use them without validation data?

We use validation set in Anomalib for finding the normalization thresholds. It is also used by few-shot models for reference images. If validation set is not used in anomaly tasks in OTX then that is a bug in the workflow.