Feature Request: Allow resource references to omit namespace if referencing a resource in same namespace as itself

We currently require that resource references to namespaced resource contains the namespace (i.e. config.kubernetes.io/depends-on: apps/namespaces/default/Deployment/wordpress-mysql). This can become a bit awkward if we have a set of resources that doesn't have the namespace set, but relies on it being resolved from the kube context. We could consider allowing the namespace to be omitted, but resolve it to the same namespace as the resource in which the annotation is set.

The issue centers on config.kubernetes.io/depends-on and namespace resolution for namespaced resources. Start by tracing the resource-reference resolution entry point and existing tests for fully qualified references; done means an omitted namespace resolves to the referencing resource's namespace without changing explicit references.