[R2] Update changelog with latest release

[rahulsuresh-cf]

Summary

Updates the R2 public changelog with the recently released UI improvements on the R2 dashboard.

Documentation checklist

• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

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PR Change Summary

Updated the R2 public changelog to reflect recent UI improvements on the R2 dashboard.

• Redesigned the bucket settings page for centralized management.
• Introduced deeplink support for prefix directories and clickable object links.
• Renamed 'r2.dev domain' to 'Public Development URL' for clarity in public access controls.

Added Files

• src/content/changelog/r2/2025-05-01-r2-dashboard-updates.mdx

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