ProgressBar: Remove aria-busy from ProgressBar

[TylerJDev]

Closes https://github.com/github/primer/issues/3360

It was noted that the usage of aria-busy on role="progressbar" is unnecessary, as it is intended for a section of the page that is currently being updated, signaling to screen readers that they should wait before announcing the content.

This PR removes the attribute from ProgressBar.

Changelog

New

Removed

• Removed aria-busy from ProgressBar

Rollout strategy

• Patch release
• Minor release
• Major release; if selected, include a written rollout or migration plan
• None; if selected, include a brief description as to why

Testing & Reviewing

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)

[changeset-bot]

🦋 Changeset detected

Latest commit: 3bf029a

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

This PR includes changesets to release 1 package

Name	Type
@primer/react	Patch

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[github-actions]

size-limit report 📦

Path	Size
packages/react/dist/browser.esm.js	96.04 KB (-0.17% 🔽)
packages/react/dist/browser.umd.js	96.44 KB (-0.02% 🔽)

[primer-integration]

👋 Hi from github/github! Your integration PR is ready: https://github.com/github/github/pull/337288