Remove Claude Code Review workflow

The claude-code-review workflow fails on bot-involved PRs ("Workflow
initiated by non-human actor") and is being retired.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QEaqko1qcY3wLLB93giokq

Author: tanghaibao