Modify Build Failure service to open issues in Azure DevOps instead of GitHub

[garath]

The DotNet.Status.Web.Controllers.AzurePipelinesController class in the DotNet.Status.Web project catches build completion webhooks from various Azure DevOps pipelines (defined in configuration files) and opens GitHub issues for certain states. The Engineering Services team has moved all issue management to Azure DevOps, so this service should now be expanded to open issues in Azure Boards.