chore: add pull_request to windows github actions (#3892)

This response from a Github PM suggests that the lack of `pull_request` in our Action config is contributing to our problem. I still think there's a bigger Github bugbear here, but after enabling the Windows checks as mandatory for PR merge, I think this change might get us to where we need to be (and is in line with the plugins repo config)

.github/workflows/node-windows.yml

@@ -1,6 +1,6 @@
 name: Node
 
-on: [push]
+on: [push, pull_request]
 
 jobs:
   build: