[Umbrella] Tracking non-Yunikorn allocations in the core

Currently, we don't know what non-YK pods are assigned to a particular node in the core. We only track the total amount of allocations as occupiedResources object inside the objects.Node type. If the tracking somehow becomes out of sync with the actual cluster state, it's very difficult to know what went wrong, because these allocations are not shown in the state dump.

In order to enhance supportability, we want to track all non-YK pods per node on the core side.