Cleanup: Litegraph/Vue synchronization work (#5789)

## Summary

Cleanup and fixes to the existing syncing logic.

## Review Focus

This is probably enough to review and test now.

Main things that should still work: 
- moving nodes around
- adding new ones
- switching back and forth between Vue and Litegraph

Let me know if you find any bugs that weren't already present there.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-5789-WIP-Litegraph-Vue-synchronization-work-27a6d73d3650811682cacacb82367b9e)
by [Unito](https://www.unito.io)

src/scripts/widgets.ts

@@ -140,7 +140,6 @@ export function addValueControlWidgets(
 
   valueControl.tooltip =
     'Allows the linked widget to be changed automatically, for example randomizing the noise seed.'
-  // @ts-ignore index with symbol
   valueControl[IS_CONTROL_WIDGET] = true
   updateControlWidgetLabel(valueControl)
   const widgets: [IComboWidget, ...IStringWidget[]] = [valueControl]
@@ -273,12 +272,10 @@ export function addValueControlWidgets(
   valueControl.beforeQueued = () => {
     if (controlValueRunBefore()) {
       // Don't run on first execution
-      // @ts-ignore index with symbol
       if (valueControl[HAS_EXECUTED]) {
         applyWidgetControl()
       }
     }
-    // @ts-ignore index with symbol
     valueControl[HAS_EXECUTED] = true
   }