[UI] Add collapsible view to visualize hierarchical Queues

Problem

Currently, the Volcano Dashboard displays all queues in a flat table, and there is no structure for visualizing hierarchical queues. This makes it difficult for users to understand the relationships between parent and child queues when names follow a hierarchy (e.g., training, training/ml, training/devops).

Proposed Solution

Implement an expandable tree view to display queues hierarchically:

⮟ queues
   ├─ queues/subqueueA
   └─ queues/subqueueB