fix: Fix CI build errors - ESM modules and test failures

[Copilot]

CI was failing due to Jest ESM module loading issues and two test failures in copilot-service.ts.

Changes

• package.json: Add NODE_OPTIONS='--experimental-vm-modules' to test script for ESM support (required by node-fetch v3+)

• convertMessagesToCopilotPrompt: Fix message ordering - was grouping messages by role instead of preserving conversation order

// Before: grouped all users, then all assistants (broken)
return systemPrompt + userPrompts + assistantResponses + ...

// After: preserves message order
for (const message of messages) {
  result += formatMessage(message);
}

• detectLanguageFromMessages: Fix regex to match file extensions followed by ? (e.g., file.cpp?)

// Before: /\.([a-zA-Z0-9]+)(?:\s|"|')/
// After:  /\.([a-zA-Z0-9]+)(?:\s|"|'|\?)/

Original prompt

fix all ci build errors

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