docs: clarify dataset format configuration for testenv

[krrish175-byte]

What type of PR is this?

/kind documentation

What this PR does / why we need it:
This PR adds detailed documentation regarding the supported dataset formats in docs/user_interface/how-to-config-testenv.md. It explains the data formats needed for train_url and test_url inside testenv.yaml and provides concrete examples for TXT, CSV, JSON, and JSONL formats so that users can easily prepare their datasets. It also cleans up redundant comments from the configuration examples for better readability.

Which issue(s) this PR fixes:
Fixes #110

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly improves the clarity and completeness of the testenv configuration documentation. By providing explicit details and practical examples for various dataset formats, it streamlines the user experience for data preparation, reducing potential confusion and errors when setting up test environments.

Highlights

• Enhanced Dataset Format Documentation: Detailed explanations and examples have been added for supported dataset formats including TXT, CSV, JSON, and JSONL, clarifying how users should prepare their data for train_url and test_url in testenv.yaml.
• Improved Readability of Configuration Examples: Redundant and verbose comments have been removed from the testenv.yaml configuration examples, making them cleaner and easier to understand.

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This pull-request has been approved by: krrish175-byte
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[gemini-code-assist]

Code Review

This pull request does a good job of adding documentation for supported dataset formats, which will be very helpful for users. The examples for TXT, CSV, JSON, and JSONL are clear. However, there's a significant inconsistency in the configuration key names for the dataset throughout the document. The property table specifies train_url and test_url, but the YAML examples use train_index/test_index and train_data/test_data_info. This is likely to cause confusion. Please unify these keys to be consistent across the documentation. Judging by the pull request description, train_url and test_url seem to be the correct keys to use.

[gemini-code-assist]

For consistency with the CSV example which uses image_path, it would be clearer to also use image_path here as the key for the path to the data.

Suggested change

	{"image": "/path/to/image1.jpg", "label": "dog"},
	{"image": "/path/to/image2.jpg", "label": "cat"}
	{"image_path": "/path/to/image1.jpg", "label": "dog"},
	{"image_path": "/path/to/image2.jpg", "label": "cat"}

[gemini-code-assist]

For consistency with the CSV example, please use image_path here as well instead of image.

Suggested change

	{"image": "/path/to/image1.jpg", "label": "dog"}
	{"image": "/path/to/image2.jpg", "label": "cat"}
	{"image_path": "/path/to/image1.jpg", "label": "dog"}
	{"image_path": "/path/to/image2.jpg", "label": "cat"}