Collapsible child resources in Graph View

### Is there an existing issue for this?

- [x] I have searched the existing issues

### Is your feature request related to a problem? Please describe the problem.

In the Aspire dashboard, the Table View allows collapsing child resources under an application (e.g., db-migration, postgresdb). This improves clarity and navigation, especially in larger solutions. However, this functionality is missing in the Graph View. All resources are shown at once, which can lead to visual clutter.

### Describe the solution you'd like

I’d like the Graph View to support collapsing and expanding child resources, just like the Table View does. Ideally, there would be a toggle or button to show/hide dependencies or child services under a particular node. This would make the graph more manageable and readable in complex applications.

An alternative could be an automatic grouping or a filter that lets users hide specific types of nodes (e.g., databases, background jobs, etc.).

### Additional context

**Table View with collapse functionality:**

**Graph View without collapse functionality:**

This feature would be especially helpful when working with microservices or multiple infrastructure dependencies, where the visual graph can grow very quickly.