SG-40595 Test

[julien-lang]

Requires shotgunsoftware/tk-ci-tools#65 to merged first.

[Copilot]

Pull Request Overview

This PR updates the Azure DevOps pipeline template to replace the existing Git authentication method with GitHub App-based authentication. The change implements a more secure token-based approach for Git operations.

Key changes:

• Removes hardcoded Git authentication using GitUserName and GitToken
• Adds GitHub App token generation using JWT and GitHub API
• Updates Git remote URL configuration to use the generated app token

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