fix: support aria-current in LinkContext

[andrew-pledge-io]

Closes #10572

Summary

Adds aria-current to the Link hook props used by LinkContext, so context provider values can include the current-link state. A RAC regression test verifies that Link renders the attribute. This aligns Link with Button and preserves its existing runtime behavior.

✅ Pull Request Checklist:

• Included link to corresponding React Spectrum GitHub Issue.
• Added/updated unit tests and storybook for this change (for new code or code which already has tests).
• Filled out test instructions.
• Updated documentation (if it already exists for this component).
• Looked at the Accessibility Practices for this feature - Aria Practices
• I understand every change in this PR and can explain why it is there.
• If AI-assisted, I followed our AI contribution guidance and pointed my assistant at CLAUDE.md.

📝 Test Instructions:

Run corepack yarn jest packages/react-aria-components/test/Link.test.js --runInBand.

Verify that <Link aria-current="page"> renders aria-current="page".

🧢 Your Project:

N/A