[savankayala05]

Summary

Port the previously prepared Workday changes from PR #454 onto main-ca, rename the DA sample folder for preview content, and document the repository's branch usage.

Changes

• Rename samples/WorkdayDeclarativeAgent to samples/WorkdayDeclarativeAgentPreview.
• Port CEA time-off reason and employee job-taxonomy updates.
• Port DA employee and manager topic updates, including response handling, data parsing, empty-result checks, and job-family reference data handling.
• Include the upstream CEA job-taxonomy README.
• Update navigation links, contribution guidance, issue-template examples, validator paths, and existing legacy exemptions for the renamed folder.
• Update validator tests and add regression coverage confirming that multiple Preview topics still fail the single-topic scope rule.
• Add root README guidance distinguishing main for DA GA/post-GA content from main-ca for DA preview and CEA content.

The changes are based directly on main-ca and exclude unrelated branch history from PR #454. Validation rules remain unchanged.

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