docs: add docs for test-set-config

[Sarthak160]

What has changed?

Please include a summary of the change.

This PR Resolves #(issue)

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue).
• New feature (non-breaking change which adds functionality).
• Breaking change (fix or feature that would cause existing functionality to not work as expected).
• Documentation update (if none of the other choices apply).

How Has This Been Tested?

Please run npm run build and npm run serve to check if the changes are working as expected. Please include screenshots of the output of both the commands. Add screenshots/gif of the changes if possible.

Checklist:

• My code follows the style guidelines of this project.
• I have performed a self-review of my own code.

[Copilot]

Pull Request Overview

This PR adds comprehensive documentation for the test-set configuration file feature in Keploy version 3.0.0. The documentation explains how to use config.yaml files alongside test data to customize runtime parameters on a per-test-set basis.

• Adds complete documentation for test-set configuration functionality
• Provides practical examples and troubleshooting guidance
• Includes best practices for managing test-set specific configurations

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[Copilot]

Inconsistent indentation in the directory structure example. Use consistent spacing (either tabs or spaces) for proper formatting in documentation.

Suggested change

	my-test-set/
	mock.yaml # Recorded mocks for this test-set
	config.yaml # Test-set specific configuration (optional)
	... # Any other assets
	my-test-set/
	mock.yaml # Recorded mocks for this test-set
	config.yaml # Test-set specific configuration (optional)
	... # Any other assets

[Copilot]

The text 'common example -' should be capitalized and have proper punctuation: 'Common example:'

Suggested change

	common example -
	Common example:

[amaan-bhati]

Thank you for adding documentation for the test-set configuration feature - the structure is thorough and the configuration table, best practices section, troubleshooting guide, and validation checklist are all valuable additions.

Consider working through a few things:

Issues to be Considered

1. Inconsistent indentation in directory tree

The directory structure code block uses a mix of tabs and spaces. Please standardize to spaces throughout so the tree renders correctly across different viewers.

2. Label formatting

There is a label that reads common example -. Please update it to Common example: - capitalize the first word and use a colon rather than a dash to match documentation conventions.

3. Version coverage

The changes are only made to the version-3.0.0 docs. Please confirm whether this feature is available in the current version and if so consider adding the documentation there as well.

4. Sidebar registration

Please confirm the new page is registered in the version-3.0.0 sidebar so it is discoverable by users navigating the docs.