Control widget fixes (#8160)

#8112 updated control widgets to be disabled when the controlled widget
is disabled. However, some workflows already exist that contain a
promoted control widget which does not function. This widget wouldn't be
marked as disabled (and thus, demoted) until the interior subgraph was
entered as updating `computedDisabled` is tacked to node draw. This is
fixed by having subgraphs eagerly update the `computedDisabled` state on
each node when configured.

Additionally, when `createCopyForNode` was used, linkedWidget retained
pointers to widgets which no longer have relation to the newly cloned
widget. This is resolved by instead not copying linkedWidgets.
Functionally, linkedWidgets is only used for control widgets and not
copying has the effect of ensuring that seed widgets linked to a
subgraph input will not display a control popover button in vue mode
which does nothing.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8160-Control-widget-fixes-2ed6d73d3650816cb397f83f558471b3)
by [Unito](https://www.unito.io)

src/lib/litegraph/src/LGraph.ts

@@ -2575,6 +2575,7 @@ export class Subgraph
 
     this.inputNode.configure(data.inputNode)
     this.outputNode.configure(data.outputNode)
+    for (const node of this.nodes) node.updateComputedDisabled()
   }
 
   override configure(

src/lib/litegraph/src/widgets/BaseWidget.ts

@@ -142,6 +142,7 @@ export abstract class BaseWidget<
       // @ts-expect-error Prevent naming conflicts with custom nodes.
       labelBaseline,
       promoted,
+      linkedWidgets,
       ...safeValues
     } = widget