Move artifact graph out of engine connection (#6062)

* cleanups

Signed-off-by: Jess Frazelle <github@jessfraz.com>

* cleanups

Signed-off-by: Jess Frazelle <github@jessfraz.com>

* fmt

Signed-off-by: Jess Frazelle <github@jessfraz.com>

---------

Signed-off-by: Jess Frazelle <github@jessfraz.com>

src/components/ModelingSidebar/ModelingPanes/FeatureTreePane.tsx

@@ -13,7 +13,7 @@ import {
   getOperationLabel,
   stdLibMap,
 } from 'lib/operations'
-import { editorManager, engineCommandManager, kclManager } from 'lib/singletons'
+import { editorManager, kclManager } from 'lib/singletons'
 import { ComponentProps, useEffect, useMemo, useRef, useState } from 'react'
 import { Operation } from '@rust/kcl-lib/bindings/Operation'
 import { Actor, Prop } from 'xstate'
@@ -58,7 +58,7 @@ export const FeatureTreePane = () => {
           const artifact = context.targetSourceRange
             ? getArtifactFromRange(
                 context.targetSourceRange,
-                engineCommandManager.artifactGraph
+                kclManager.artifactGraph
               )
             : null