Decrease a time for making a workspace

[eunwoosh]

Summary

To decrease time for making a workspace, remove a code to reformat the python text using yapf.
This change makes python file saved in workspace a little unprettier, but it's still human readable.
How much time can be saved is as below:

• classification : -0.1 sec
• detection : -1.2 sec
• segmentation : -0.6 sec

Added code is copied from mmcv but remove yapf part.

How to test

Checklist

• I have added unit tests to cover my changes.​
• I have added integration tests to cover my changes.​
• I have added e2e tests for validation.
• 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) 2023 Intel Corporation
# SPDX-License-Identifier: Apache-2.0

[sungmanc]

LGTM, with minor comment

[goodsong81]

A little bit concerned about copying code block, but let's keep going.
Better if we have a small test for the block.