- remove spawn util, refactor help command
- add tests for read-user-info, minor refactor
- add tests for pulse-till-done util, refactor
- add tests for otplease util
- add tests for open-url util
- remove unused no-progress-while-running util

PR-URL: #2601
Credit: @nlf
Close: #2601
Reviewed-by: @ruyadorno, @wraithgar

The "do you have auth configured" only takes into consideration a hard-coded
"registry" config, which means that if you don't have auth configured for
the npm registry, but you do for the one you have tied to a scope elsewhere
in your npmrc, we would erroneously tell you that to add a token.

This uses the same method that the rest of the publish chain uses to determine
which registry it would be publishing to, then sees if you have auth for THAT registry.

Because that other function does a hard fallback to the npm registry, there is no more
need for the exception we throw if you do not have one configured.  Also, the npm cli
already defaults that config item, so you can't even set it to a falsey value if you
wanted

PR-URL: #2613
Credit: @nlf
Close: #2613
Reviewed-by: @ljharb, @wraithgar

Fixes a compatibility issue in `npm ls` due to the subtle internal
change of optional dependencies being pruned from dependencies in
`read-package-json-fast@2.0.0` update.