[VFX] Right clicking on a Group Node does not have an Ungroup or Delete Group option

To reproduce:
1. Create a new project
2. Install Visual Effect Graph
3. Create a Visual Effect Graph
4. Create a Group Node in Visual Effect Graph
5. Select the group node
6. Right click on the group node
Expected result: There is an option to Ungroup or to detele Group Node
Actual Result: Therei so only a Delete option, which deletes the Group node.

Note: This is not really consistent with how most other software operates, where deleting a parent object also deletes the contents, as such there should be a rename to this function.

Reproduced on: 2020.1.0a14, 2020.1.0a1, 2019.3.0.b12
Visual Effect Graph Versions: 7.0.1, 7.1.5