Fix promoted assets not being assets in vue (#7576)

- Fixes asset widgets which have been promoted failing to display as
asset widgets and having red names in vue mode.
- Fixes promoted subgraph widgets failing to resolve inputSpec for use
in vue mode.

| Before | After |
| ------ | ----- |
| <img width="360" alt="before"
src="https://github.com/user-attachments/assets/6c2d2763-6ac3-4769-82c5-b1ab1cc5e945"/>
| <img width="360" alt="after"
src="https://github.com/user-attachments/assets/742e218b-ec42-411a-b5a2-021820031e2a"
/>|

I'm not excited that this creates further bloat of SimplifiedWidget.

Known issue
- Similar to #7550, subgraph widgets will have an incorrect callback and
will fail to update value on a fresh reload. This can be "fixed" (made
worse) by entering and exiting the subgraph. Since this creates a
'leaked' widget callback which will then be called.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7576-Fix-promoted-assets-not-being-assets-in-vue-2cc6d73d3650814b8734f69b225b0228)
by [Unito](https://www.unito.io)

src/types/simplifiedWidget.ts

@@ -64,6 +64,9 @@ export interface SimplifiedWidget<
   /** Widget options including filtered PrimeVue props */
   options?: O
 
+  /** Override for use with subgraph promoted asset widgets*/
+  nodeType?: string
+
   /** Optional serialization method for custom value handling */
   serializeValue?: () => any