Moving ProgressBar component css

[jonrohan]

Description

tracking https://github.com/github/primer/issues/1342

This pull request has the goal to move CSS for the Progress Bar component from primer/css to here.

1. moves the Primer::ProgressBarComponent to Primer::Beta::ProgressBar.
2. Deprecates old Primer::ProgressBarComponent name
3. Adds new progress_bar.pcss file.

Integration

Does this change require any updates to code in production?

Yes, this line should be removed on dotcom:

- @import '@primer/css/progress/progress.scss';

Merge checklist

• Added/updated tests
• Added/updated documentation
• Added/updated previews

[changeset-bot]

🦋 Changeset detected

Latest commit: 4931cda

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@primer/view-components	Patch

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