Ensure portfolios and products match code

[jmflynn81]

It would be nice if the pipeline work would be able to not only create new portfolios and products, but also recognise when portfolios or products are removed from the code and tidy up any related resources, i.e. remove products (including product templates), portfolios and stacks/code* elements when removed from the definition. This could perhaps be achieved by comparing git diffs or with the current state stored in an s3 bucket.
This would then make the code the source of truth for all created products/portfolios without requiring a manual clean up.