Your company relies on Azure Pipelines and Azure Repos for its continuous integration and continuous deployment (CI/CD) workflows, aiming to deploy applications to the Azure environment efficiently. To enhance your deployment process in accordance with DevSecOps control guidelines outlined in the Microsoft Cloud Adoption Framework for Azure, you are tasked with updating your procedures. Specifically, you need to propose a solution that mandates all code changes be submitted via pull requests before they are deployed through the CI/CD workflow. What should you include in your recommendation to achieve this requirement?