Fix npm commands missing standard output

[sverdlov93]

• All tests passed. If this feature is not already covered by the tests, I added new tests.
• All static analysis checks passed.
• This pull request is on the dev branch.
• I used gofmt for formatting the code before submitting the pull request.

---

should fix jfrog/jfrog-cli#2089

[eyalbe4]

Let's add a follow-up with a test to jfrog-cli project, to ensure this functionality does not break in the future.