Highlight root parameter that is connected to the failing provider.

[YooSunYoung]

Workflow errors often comes from setting wrong parameter (wrong file or wrong number).
By just looking at the error message, it's not always very clear which parameter was wrong.

It'll be nice if the error message contains the root parameters types that are connected to the failing providers,
including the specific TypeVar.

[SimonHeybrock]

Can you give an example? You would like to include all the input types of the provider that causes the exception? Or are you suggesting to propagate backwards to all the input nodes and have a full list (similar to #213 but printing all paths)?