Standardize project and workflow export to match portability spec

[josephjclark]

In order to line up the portability spec across our tools, we need to ensure:

1. Exporting a project should download a CLI compatible stateless project file (as described in Project: allow me to write a new project.yaml file without UUIDs kit#1398)
2. Exporting (and importing) a workflow should use the CLI's workflow format (as described in Different workflow formats in CLI and Lightning (breaks workflow import!) kit#1117)

If we do these things, then file formats across the CLI and lightning will finally be fully aligned and interopable and compatible. And we can make the Portability Spec really mean something,

Additional: when exporting workflow and project files from the app, let users choose the format.

[josephjclark]

templates are also affected by this!

look at canonical_template.yaml