Add documentation for testing Automation with arguments

[senurah]

Purpose

Resolves Add documentation for executing manual task #131

Goals

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Approach

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Documentation

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Training

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Certification

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Automation tests

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• Integration tests

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Security checks

• Followed secure coding standards in http://wso2.com/technical-reports/wso2-secure-engineering-guidelines? yes/no
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[CLAassistant]

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[Copilot]

Pull Request Overview

Adds documentation to guide users on manually testing automations and passing runtime arguments, including samples for WSO2 MI and Ballerina.

• Introduces a new "Optional: Test the Automation manually" section
• Documents "Run with Arguments" usage and provides sample links for WSO2 MI and Ballerina
• Adds an informational note about future user portal feature accessibility

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