Overlay: Add accessible names to Overlay dialog examples

[TylerJDev]

Adds an accessible name (aria-label) to Overlay dialogs.

Dialogs are typically named based on the content it provides, adding labels to the dialogs in the stories help convey what the dialog is for initially to assistive technologies.

Changelog

New

• Adds aria-label to Overlay dialog examples

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 - This is a storybook only change and doesn't change anything else.

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]

⚠️ No Changeset found

Latest commit: 90b2471

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[github-actions]

size-limit report 📦

Path	Size
packages/react/dist/browser.esm.js	100.04 KB (0%)
packages/react/dist/browser.umd.js	100.35 KB (0%)

[primer-integration]

👋 Hi from github/github! Your integration PR is ready: https://github.com/github/github/pull/352659

[primer-integration]

🟢 golden-jobs completed with status success.

[TylerJDev]

After looking at the conflicts, we don't need this change anymore as we've added it in another PR. Closing!