kpt fn render should should preserve sub-package path hiearchy

[jashandeep-sohi]

Expected behavior

Given there's a sub-package in the current/root package, I would expect a kpt fn render done in the root package to pass all resources in the sub-package with a internal.config.kubernetes.io/path annotation that includes/prefixes a relative path to the sub-package.

Actual behavior

internal.config.kubernetes.io/path does not contain the path to the sub-package itself. It's relative to the sub-package, i.e. as if kpt fn render was called from that directory.

Information

Using the latest build from main.

Steps to reproduce the behavior

mkdir -p my-pkg my-pkg/sub-pkg

cat <<EOF > my-pkg/Kptfile
apiVersion: kpt.dev/v1
kind: Kptfile
metadata:
  name: my-pkg
  annotations:
    config.kubernetes.io/local-config: "true"
pipeline:
  mutators:
    - exec: tee /dev/fd/2
EOF

cat <<EOF > my-pkg/sub-pkg/Kptfile
apiVersion: kpt.dev/v1
kind: Kptfile
metadata:
  name: sub-pkg
  annotations:
    config.kubernetes.io/local-config: "true"
EOF

pushd my-pkg

kpt fn render --allow-exec --truncate-output=false

Notice that internal.config.kubernetes.io/path for sub-pkg/Kptfile is incorrect.