chore(release): Release candidate v0.59.0-rc1

[lakshmimsft]

This pull request updates the versions.yaml file to add support for a new release candidate version (v0.59.0-rc1) and update the deprecated versions list.

Please explain the changes you've made.

• This pull request is a minor refactor, code cleanup, test improvement, or other maintenance task and doesn't change the functionality of Radius

Contributor checklist

Please verify that the PR meets the following requirements, where applicable:

• An overview of proposed schema changes is included in a linked GitHub issue.
  • Yes
  • Not applicable
• A design document is added or updated under eng/design-notes/ in this repository, if new APIs are being introduced.
  • Yes
  • Not applicable
• The design document has been reviewed and approved by Radius maintainers/approvers.
  • Yes
  • Not applicable
• A PR for resource-types-contrib is created, if resource types or recipes are affected by the changes in this PR.
  • Yes
  • Not applicable
• A PR for dashboard is created, if the Radius Dashboard is affected by the changes in this PR.
  • Yes
  • Not applicable
• A PR for the documentation repository is created, if the changes in this PR affect the documentation or any user facing updates are made.
  • Yes
  • Not applicable

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

Scanned Files

None

[Copilot]

Pull request overview

This pull request updates the repository’s release-version manifest (versions.yaml) to add the next release candidate (v0.59.0-rc1) as the newest supported version and to ensure the deprecated versions are listed under a top-level deprecated: key. This aligns with the release workflow behavior that scans .supported[] entries in order.

Changes:

• Added channel: '0.59' with version: 'v0.59.0-rc1' at the top of the supported list.
• Moved/positioned the deprecated: section as a top-level key immediately after the supported list (so deprecated entries are clearly separated from supported ones).