[WIP] Fix failing GitHub Actions job 'Integration: Workflow Features'

[Copilot]

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Fix the failing GitHub Actions job "Integration: Workflow Features"
Analyze the Actions logs, identify the root cause of the failure, and implement a fix.
Check run ID: 83108335417
Job URL: https://github.com/github/gh-aw/actions/runs/28072001997/job/83108335417

[Copilot]

Pull request overview

This PR updates the Copilot HTTP MCP integration test to expect the correct JSON escaping for ${VAR}-style environment variable references when rendered into the Copilot MCP config output, addressing the failing “Integration: Workflow Features” job.

Changes:

• Adjusts expected MCP config substrings from \${VAR} to \\${VAR} for HTTP header and env passthrough checks.
• Aligns integration test expectations with the existing shared MCP HTTP header rendering behavior (and related unit tests).

Show a summary per file

File	Description
pkg/workflow/copilot_mcp_http_integration_test.go	Updates integration test expectations to match the JSON-escaped env-var reference format emitted by MCP config rendering.

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