Add replicas field to ReplicaSet info collection on resource tree

[zhammer]

Summary

Curious what the appetite is for adding a replicas field to the ReplicaSet info collection on the resource tree.

Motivation

1. It'd be helpful when looking at ReplicaSets in the ArgoCD UI to have a quick view of how many replicas are configured for that rs in the form of an info label
2. Having replicas count info in the resource-tree API would help in allowing tools that ingest from that API to show deployment progress, quickly add up total pod counts, etc.

We realize we can use #11153 for this, duplicating the spec.replicas to a custom label but are curious if it'd make sense to have this as ReplicaSet specific info field, like the Pod-specific info fields (https://github.com/argoproj/argo-cd/blob/40760eb8528766745328e67e124e2cf1f56d8d93/controller/cache/info.go#L281C16-L281C16).

Proposal

Similar to https://github.com/argoproj/argo-cd/blob/40760eb8528766745328e67e124e2cf1f56d8d93/controller/cache/info.go#L281C4-L281C4, have a populateReplicaSetInfo function that adds the replica count to the resource info.