[backport core/1.36] fix: disable frustum culling for SkinnedMesh to prevent clipping during animation (#7988)

Backport of #7856 to `core/1.36`

Automatically created by backport workflow.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7988-backport-core-1-36-fix-disable-frustum-culling-for-SkinnedMesh-to-prevent-clipping-dur-2e76d73d3650811c8f4bd904df44c9e7)
by [Unito](https://www.unito.io)

Co-authored-by: Terry Jia <terryjia88@gmail.com>

src/extensions/core/load3d/LoaderManager.ts

@@ -160,6 +160,10 @@ export class LoaderManager implements LoaderManagerInterface {
         fbxModel.traverse((child) => {
           if (child instanceof THREE.Mesh) {
             this.modelManager.originalMaterials.set(child, child.material)
+
+            if (child instanceof THREE.SkinnedMesh) {
+              child.frustumCulled = false
+            }
           }
         })
         break
@@ -203,6 +207,10 @@ export class LoaderManager implements LoaderManagerInterface {
           if (child instanceof THREE.Mesh) {
             child.geometry.computeVertexNormals()
             this.modelManager.originalMaterials.set(child, child.material)
+
+            if (child instanceof THREE.SkinnedMesh) {
+              child.frustumCulled = false
+            }
           }
         })
         break