Return a more precise error on 403 PUT error for existing package

[rubengmurray]

What / Why

Return a clearer error message when trying to publish a package for the first time but the package name is already in use. Include the fact more clearly in the error response, so that I know only a simple name change is needed to make things work.

When

Running npm publish when trying to add a new package to the registry

Where

CLI

How

N/A

Current Behavior

npm ERR! code E403
npm ERR! 403 403 Forbidden - PUT https://registry.npmjs.org/joi-error-formatter - You do not have permission to publish "joi-error-formatter". Are you logged in as the correct user?
npm ERR! 403 In most cases, you or one of your dependencies are requesting
npm ERR! 403 a package version that is forbidden by your security policy.

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/user/.npm/_logs/2020-05-09T10_54_44_120Z-debug.log

Expected Behavior

Only needs a couple of words added perhaps between permission to publish and "package-name".

For example:
permission to publish **to existing npm package** "joi-error-formatter"

Who

New package publishers

References

• n/a