[Accessibility][Storybook] Add aria-labels to the multiple item progress bar

[kendallgassner]

Closes https://github.com/github/accessibility-audits/issues/10134

In this PR I add an aria-label to each role='progressbar'. Before merging I am trying to determine if role='meter' would be better suited for progress bars with multiple items.

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• Patch release
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I am updating a storybook story.

Testing & Reviewing

Tested with a screen reader.

Merge checklist

• Added/updated tests
• Added/updated documentation
• Added/updated previews (Storybook)
• Changes are SSR compatible
• Tested in Chrome
• Tested in Firefox
• Tested in Safari
• Tested in Edge
• (GitHub staff only) Integration tests pass at github/github (Learn more about how to run integration tests)

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[github-actions]

size-limit report 📦

Path	Size
packages/react/dist/browser.esm.js	104.2 KB (0%)
packages/react/dist/browser.umd.js	104.49 KB (0%)