Limit nodes opened by default in the JSON Tree component (#11002)

- Add a parameter to choose which nodes to open by default
- On the Admin Panel, open all nodes by default
- On the Workflow Run step output, open only the two first depths
- On the Workflow Run step input, open only the previous step first
depth
- Display `[empty string]` when a node is an empty string
- Now, display `null` instead of `[null]`

## Demo


https://github.com/user-attachments/assets/99b3078a-da3c-4330-b0ff-ddb2e360d933

Closes https://github.com/twentyhq/core-team-issues/issues/538

packages/twenty-ui/src/json-visualizer/utils/isTwoFirstDepths.ts

@@ -0,0 +1,4 @@
+import { ShouldExpandNodeInitiallyProps } from '@ui/json-visualizer/contexts/JsonTreeContext';
+
+export const isTwoFirstDepths = ({ depth }: ShouldExpandNodeInitiallyProps) =>
+  depth <= 1;