Fix Copilot CLI path resolution in agentic workflows (#48725)

* Initial plan

* Fix Copilot CLI path in agentic workflows

Co-authored-by: msyyc <70930885+msyyc@users.noreply.github.com>

* Limit Copilot CLI path fix to management SDK review

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: msyyc <70930885+msyyc@users.noreply.github.com>
Co-authored-by: Yuchao Yan <yuchaoyan@microsoft.com>

Author: Copilot