[WIP] Fix failing GitHub Actions workflow for skill tests

[Copilot]

• Investigate failing CI workflow (job 65215090701)
• Identify root cause: PR add azure-cloud-migrate skill for cross-cloud workload migration #1069 changed azure-prepare SKILL.md description but snapshot was not updated
• Apply azure-prepare SKILL.md description change (add EXCEPT cross-cloud migration routing)
• Add azure-cloud-migrate skill files (SKILL.md, references, workflow-details.md)
• Add azure-cloud-migrate test files (triggers.test.ts, unit.test.ts)
• Update tests/skills.json to include azure-cloud-migrate
• Update azure-prepare snapshot file to match new description/keywords
• Verify tests pass locally

Original prompt

Fix the failing GitHub Actions workflow Run All Skill Tests
Analyze the workflow logs, identify the root cause of the failure, and implement a fix.
Job ID: 65215090701
Job URL: https://github.com/microsoft/GitHub-Copilot-for-Azure/actions/runs/22509361050/job/65215090701

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[saikoumudi]

didn't intend for copilot to fix this issue