DialogV2: Add alpha status to docs

[TylerJDev]

Closeshttps://github.com/github/primer/issues/4749

We should promote DialogV2 to alpha status in the Primer docs. We have already accomplished most of the work in v37, this ensures that the component has the correct status in our docs.

Changelog

Changed

• Changed status draft to alpha
• Move DialogV1 to deprecated stories in Storybook

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]

⚠️ No Changeset found

Latest commit: 12a08a4

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[github-actions]

size-limit report 📦

Path	Size
packages/react/dist/browser.esm.js	106.01 KB (0%)
packages/react/dist/browser.umd.js	106.29 KB (0%)

[TylerJDev]

With #5740 being merged, we can go ahead and merge this too! The status will be reflected after our next release, which will also include a fix that closes out the remaining Dialog accessibility issues.