Automate your open-source dependency scanning with Advanced Security

Introduces automated injection of the dependency scanning task into Azure Pipelines runs targeting the default branch. This task evaluates open-source dependencies for vulnerabilities. It also enables pull request annotations for dependency scanning findings and integrates with repository build validation policies. Configuration options include enabling 'Scan default branch for vulnerable dependencies' in repository settings or using environment variables like `DependencyScanning.Skip: true` or pipeline variables like `dependencyScanningInjectionEnabled` to control injection.