[INT-6554] ATS Workday Assessment T2 Doc Improvements

[sourabh-stackone]

Context

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Summary by cubic

Streamlined the Workday Assessments (T2) doc to focus on the recruiter workflow: apply on behalf, move to Assessment, and send invites, with clear Start Proxy and non‑proxy options. Addresses INT-6554 by removing obsolete setup steps and making the guide easier to follow.

• Refactors
  • Retitled page and rewrote content around an end-to-end recruiter flow.
  • Removed admin-only setup (assessment categories/tests/statuses and Assess Candidate BP payload config).
  • Added concise steps to find/create job requisitions within Supervisory Organisations; updated screenshots and warnings.
  • Clarified invite sending (recruiter, Start Proxy, or without), verification, and results; note that setting Overall Status to Invited triggers the webhook.

[Copilot]

Pull Request Overview

This PR restructures and improves the Workday Assessment documentation to focus on the candidate workflow rather than the technical setup. The changes streamline the content by removing detailed configuration steps and emphasizing the practical steps for managing candidate assessments.

• Reorganized content to focus on candidate workflow (applying, moving to assessment stage, sending invitations)
• Removed technical setup sections (assessment categories, tests, statuses, business process configuration)
• Improved clarity and readability with better section organization and simplified language

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