feat(node): Handle scope excludes in Pnpm

The handling of scope excludes worked until [1], which accidentally
missed to implement the handling in the new `Pnpm` code.

This may be used as a work around for a bug in the `pnpm` CLI, which
fails in case the output JSON dependency tree exceeeds some limit, see
[2].

Fixes #9405.

[1]: 0eb1eea
[2]: #9405

Signed-off-by: Frank Viernau <frank_viernau@epam.com>