Docs: Add detailed guide on Pre Script and Post Script

[mustafa-sayyed]

• I have added a detailed guide on Pre Script and Post Script and How to use scripts to automate API Testing

[Copilot]

Pull request overview

This PR adds a comprehensive guide on automating API testing using Requestly's Pre-request and Post-response scripting features. The guide is aimed at developers who want to streamline repetitive API testing tasks through JavaScript-based automation.

Key changes:

• Introduces scripting concepts and core API objects (rq, rq.request, rq.response, rq.test, rq.expect, rq.environment)
• Provides practical examples for authentication token management, pagination, response validation, and NPM package integration
• Includes code samples demonstrating real-world use cases

Reviewed changes

Copilot reviewed 1 out of 3 changed files in this pull request and generated 10 comments.

File	Description
guides/community-content/automate-testing-via-scripts-in-requestly.mdx	New documentation guide with examples and explanations of Pre-request and Post-response scripts
images/guide-pre-and-post-scripts/scripts.png	Screenshot image showing the Requestly scripts interface

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