[Usability] Removing a central node does not remove the neighbors

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**Describe the bug**
A clear and concise description of what the bug is and the environment/context.

There was an expectation that removing a central node would also remove all the connected neighbors. Now it just shows all the previously connected objects as singletons in the view.

**To Reproduce**
Steps to reproduce the behavior:
1. Add a node that has multiple neighbors to Graph View on Graph Explorer
2. Double-click to expand.
3. Select the original node in Step 1 and click delete.
4. See that the node's neighbors are left.

**Expected behavior**
Provide an option to delete node and its neighbors or something similar.