[BUG] npm 7.x ignores publishConfig.registry

[MikaelX]

Current Behavior:
npm publish does not follow publishConfig.registry, if registry is .npmrc it will try to publish to that, if not npm.org.

Expected Behavior:
npm publish publish to defined publishConfig.registry as it did in 6.x.

Steps To Reproduce:
Install npm@7
Set publishConfig.registry IE: "publishConfig": { "registry": "https://..." }
Run npm publish
Environment:
OS: Mac OS BigSur
Node: 15.4.0
npm: 7.4.3

Same bug as
Bug 1937

Reverting back to npm@6 will solve the issue

[wraithgar]

#1937 has been fixed, and the related ENEEDAUTH bug is tracked in #2567 and will be closed by #2602