fix: inner groups being moved double when moving outer group (in vue mode) (#7447)

## Summary

Fixes issue when dragging a group that had inner groups when in vue
mode.

When dragging the outer group in Vue mode:

1. getAllNestedItems(selected) returns ALL items: outer group + inner
groups + nodes
2. moveChildNodesInGroupVueMode loops through all items
3. For outer group G1: calls G1.move(delta, true) then
moveGroupChildren(G1, ...)
4. moveGroupChildren calls G2.move(delta) (no skipChildren) - this moves
G2 AND G2's children!
5. Then the loop reaches G2: calls G2.move(delta, true) - moves G2 again
6. Plus moveGroupChildren(G2, ...) processes G2's children again

This PR fixes it by adding `skipChildren=true` to the `move` call.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7447-fix-inner-groups-being-moved-double-when-moving-outer-group-in-vue-mode-2c86d73d365081ce97abec682f2a8518)
by [Unito](https://www.unito.io)

browser_tests/assets/groups/nested-groups-1-inner-node.json

@@ -0,0 +1,92 @@
+{
+  "id": "2ba0b800-2f13-4f21-b8d6-c6cdb0152cae",
+  "revision": 0,
+  "last_node_id": 17,
+  "last_link_id": 9,
+  "nodes": [
+    {
+      "id": 17,
+      "type": "VAEDecode",
+      "pos": [
+        318.8446183157076,
+        355.3961392345528
+      ],
+      "size": [
+        225,
+        102
+      ],
+      "flags": {},
+      "order": 0,
+      "mode": 0,
+      "inputs": [
+        {
+          "name": "samples",
+          "type": "LATENT",
+          "link": null
+        },
+        {
+          "name": "vae",
+          "type": "VAE",
+          "link": null
+        }
+      ],
+      "outputs": [
+        {
+          "name": "IMAGE",
+          "type": "IMAGE",
+          "links": null
+        }
+      ],
+      "properties": {
+        "Node name for S&R": "VAEDecode"
+      },
+      "widgets_values": []
+    }
+  ],
+  "links": [],
+  "groups": [
+    {
+      "id": 4,
+      "title": "Outer Group",
+      "bounding": [
+        -46.25245366331014,
+        -150.82497138023245,
+        1034.4034361963616,
+        1007.338460439933
+      ],
+      "color": "#3f789e",
+      "font_size": 24,
+      "flags": {}
+    },
+    {
+      "id": 3,
+      "title": "Inner Group",
+      "bounding": [
+        80.96059074101554,
+        28.123757436778178,
+        718.286373661183,
+        691.2397164539732
+      ],
+      "color": "#3f789e",
+      "font_size": 24,
+      "flags": {}
+    }
+  ],
+  "config": {},
+  "extra": {
+    "ds": {
+      "scale": 0.7121393732101533,
+      "offset": [
+        289.18242848011835,
+        367.0747755524199
+      ]
+    },
+    "frontendVersion": "1.35.5",
+    "VHS_latentpreview": false,
+    "VHS_latentpreviewrate": 0,
+    "VHS_MetadataImage": true,
+    "VHS_KeepIntermediate": true,
+    "workflowRendererVersion": "Vue"
+  },
+  "version": 0.4
+}