Feature Request: Clone resources from local cluster to remote cluster

# Summary

Provide the ability to supply a resource manifest to one application where that resource already exists in another application

# Motivation

Needing to pass secrets and certificates to external clusters from local cluster.
We are using external secrets operator to sync in cluster secrets with external secret store. However, this only applies to secrets on the cluster where external secrets operator is installed. We want to propagate the secrets to clusters that are also managed by argocd but are not able to communicate with our external secret operator.

# Proposal

It should be another field or property in the application manifest where you can reference an existing resource from another application as a template such that if the original is modified, the cloned resource will show as out of sync.

No files, tests, or entry points are named. Start by examining how Argo CD applications render and sync Kubernetes resources across clusters; define the manifest reference and out-of-sync behavior, then add coverage showing that cloned resources follow changes to the original.

Written by the indexing model from the issue text.