fix: Disable Azure login in validate-queries workflow

[arthurclares]

Overview/Summary

Remove pull_request_target workflow but preserving the code for future reference.

As part of this pull request I have

• Read the Contribution Guide and ensured this PR is compliant with the guide
• Checked for duplicate Pull Requests
• Associated it with relevant GitHub Issues or ADO Work Items (Internal Only)
• [ x Ensured my code/branch is up-to-date with the latest changes in the main branch
• Ensured PR tests are passing
• Performed testing and provided evidence (e.g. screenshot of output) for any changes associated to ARG queries
• Updated relevant and associated documentation (e.g. Contribution Guide, Docs etc.)

[Copilot]

Pull Request Overview

This PR disables the Azure login functionality in the validate-queries workflow by commenting out the Azure login step and the pull_request_target trigger, while preserving the workflow file for future reference by renaming it to .old.

• Commented out the pull_request_target trigger that was used to run the workflow on PR events
• Disabled Azure login step while keeping the authentication configuration for future use
• Renamed the workflow file to preserve the implementation for potential future reactivation

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}