Check for Running Pipeline in ADF without Database Support

[mrpaulandrew]

Create a utility to check if a given pipeline name is already running and prevent another execution if it is.

Do this within Data Factory without needing content from the Current Execution table.

[mrpaulandrew]

Breaking change

Data Factory requires access to itself via its own MSI for this to work.

Generic implementation details:

https://mrpaulandrew.com/2020/11/12/get-data-factory-to-check-itself-for-a-running-pipeline-via-the-azure-management-api/