Disable progress bar

[olingern]

Summary
Per #1956, this enables users to specify a JSON key, noProgress, in their package.json to disable the progress bar from showing.

Test plan
Small refactor for testability, created __tests__/cli/index.js file and tests for addition.

Using feature
Adding the following the package.json will disable progress bar output:
"noProgress": true,

[torifat]

IMO, it's better to handle it in yarn config than package.json. Lets see what others think.

[gihrig]

it's better to handle it in yarn config than package.json

Config file vs package.json seems to come down to preference.

I would opt for both. The react-boilerplate project makes a point of keeping the project root as clean as practical. That's nice but it adds a lot of complexity to package.json. This choice is enabled by packages that support both options, eslint for example.

[torifat]

@gihrig I wasn't talking about config file in project folder but global config.

Is there any use case where you want to disable progress only for a specific repo?

[gihrig]

@torifat Probly not. I have npm progress bar disabled in global config and never wanted otherwise. So I agree, on second thought, package json makes little sense.

[olingern]

@torifat Will refactor this to use yarn config unless there are any objections from others :)

[olingern]

@torifat This has been refactored to use yarn config

[torifat]

LGTM cc @bestander