Refactor ProgressBar to use Sass Modules

[tw15egan]

This issue is for updating the ProgressBar to Sass Modules in the @carbon/styles package. In this refactor, we will:

Copy over styles for for the component to packages/styles/scss/components/progress-bar/_progress-bar.scss
Any additional files will live in the folder packages/styles/scss/components/progress-bar/
Create an _index.scss at packages/styles/scss/components/progress-bar/_index.scss
Create a test file at packages/styles/scss/components/tests/progress-bar.js
Add storybook to packages/carbon-react
The _index.scss should:

@forward the mixin and any variables from _progress-bar.scss
Include the styles from _progress-bar.scss by calling the mixin
The progress-bar-test.js file should test the following:

The Public API of the progress-bar/_index.scss file
Any configuration options that are present for the file
The _progress-bar.scss will then need to be refactored to use the new import paths and conventions. You can find common recipes here: #8899