fix(editor): Fix copy/paste issue when switch node is in workflow (#8103)

## Summary
Fix bug where copy/pasting a node breaks the view. Issue seems to be
that copied workflow does not have Switch node when workflow is
rerendering..

<img width="1942" alt="Screenshot 2023-12-19 at 18 16 23"
src="https://github.com/n8n-io/n8n/assets/4711238/ad53b8ae-3693-4733-8f6b-7bc9e7b9d216">




## Related tickets and issues
[Linear ticket
ADO-1504](https://linear.app/n8n/issue/ADO-1504/unwanted-nodes-connections-after-copypaste-of-n8n-form-trigger)


## Review / Merge checklist
- [X] PR title and summary are descriptive. **Remember, the title
automatically goes into the changelog. Use `(no-changelog)` otherwise.**
([conventions](https://github.com/n8n-io/n8n/blob/master/.github/pull_request_title_conventions.md))
- [ ] [Docs updated](https://github.com/n8n-io/n8n-docs) or follow-up
ticket created.
- [x] Tests included.
> A bug is not considered fixed, unless a test is added to prevent it
from happening again.
   > A feature is not complete without tests.

packages/editor-ui/src/stores/nodeTypes.store.ts

@@ -96,6 +96,9 @@ export const useNodeTypesStore = defineStore(STORES.NODE_TYPES, {
 		},
 		isConfigNode() {
 			return (workflow: Workflow, node: INode, nodeTypeName: string): boolean => {
+				if (!workflow.nodes[node.name]) {
+					return false;
+				}
 				const nodeType = this.getNodeType(nodeTypeName);
 				if (!nodeType) {
 					return false;