Tree-view: Always show PodGroup in replicaset when Child Pod node exist

[ashutosh16]

Summary

In the Tree View, when the user clicks on the group node, the last node shows as a replicaset that groups the same kind of sibling (replicaset).

This UI experience seems inconsistent. When multiple replicaset nodes exist, it displays node groups of the same kind, in this case replicaset, whereas when only one replicaset node exists, it displays podGroup.

Consistent UI experience should be provided where the user always sees podGroup on replicaset whenever child pods exist.

Current UI - when multiple replicaset nodes exist

Current UI - When only one replica set node exists, UI shows pod group.

The enhancement should expand the replicaset in podGroup view when child pod exists and group the sibling node when no further child node exists

[keithchong]

The current behaviour is implemented as designed from point 10 from PR #8661
The grouped nodes have always taken precedent, but I can see the benefit of special-casing the replicasets and pulling them out as a pod group.

Three RS, but one RS with at least one pod:

...and with Group Nodes enabled:

Note the other situation where only one RS has no associated pods:

...and with Group Nodes enabled:

[ashutosh16]

@keithchong Thanks for looking into it.
UX seems right to me ( pic 2 & 3). This would be a special case when RS is expanded as podGroup when child pod exit