fix(npm): Collect issues when listing the packages instead of failing

If `npm list` returns with a non-zero exit code, do not throw an
exception and consequently stop the analysis.
Instead, collect the errors from `stderr` as `Issue`s and continue
analyzing the project, because useful dependency information may still
be available.

Resolves #9551.

Signed-off-by: Marcel Bochtler <[email protected]>