CI/CD Pipeline for Azure Functional Tests

[tessmichi]

📝 Description

Set up continuous integration pipeline that:

• Runs on all pull requests to validate Azure Function code changes
• Executes Python unit tests (pytest) for the function app
• Validates function app can be built successfully
• Runs Terraform validation and plan for infrastructure changes
• Implements nightly test runs against main branch to ensure ongoing stability
• Includes both unit tests and Terraform tests (acceptance and integration)
• Reports test results in PR comments for visibility

🔰 Code of Conduct

• I agree to follow this project's Code of Conduct.