On "Refresh Node Definitions", reload state of nodes in subgraphs

[christian-byrne]

Originally reported here: #4609 (comment)

┆Issue is synchronized with this Notion page by Unito

[blepping]

Refresh also doesn't update file lists for nodes in a subgraph. I.E. you download a new model file, hit refresh and you still won't find the new file in the list. The only way to deal with it that I've seen is to create a completely new node which will will reflect the refreshed values.