Always run the pipeline evaluation step

[jotaylo]

Set the ci-build-train pipeline to always run the evaluation step (even if the pipeline is cancelled). This will cause the Azure Pipeline to log the reason for cancellation rather than just "silently failing".
#151

[omartin2010]

I would add a note in the documentation that says that the ML pipeline actually cancels itself. If you write the code yourself, that's obvious but if not, it's not particularly obvious.

[jotaylo]

@omartin2010 , @sudivate's change yesterday added a flag to disable the cancellation. The docs will need to be updated to mention both the default cancellation state and how to disable it.