test: set process code to 0 for verifying npm

[anonrig]

man ls documentation states that:

   Exit status:
       0      if OK,

       1      if minor problems (e.g., cannot access subdirectory),

       2      if serious trouble (e.g., cannot access command-line
              argument).

Fixes #45318

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/47688/

[mscdex]

This doesn't seem right. AFAICT 1 should be the correct exit code when no arguments are passed to npm as it should display usage in that case.

[anonrig]

OK the issue is resolved after merging #45315