Allow running npm audit without node_modules

[yahavi]

Is your feature request related to a problem? Please describe.
Currently, jf audit-npm requires the presence of node_modules.

Describe the solution you'd like to see
We can bypass it in npm >= 7 if we provide the --package-lock-only, like we do in Intellij IDEA plugin: jfrog/ide-plugins-common#71

Describe alternatives you've considered
Running npm install before audit.

Additional context
It looks like the audit-npm tries to resolve the sha256 files from the npm cache. We probably don't really need them in the npm-audit.

[yahavi]

Fixed by #1473