Fix ESM/CJS runtime failure in auto-answer-issues workflow

[Copilot]

require("openai") fails at runtime under Node 20 because openai v4+ is ESM-only. Same issue applies to @octokit/rest v19+.

Changes proposed in this request

• Moved require("openai") and require("@octokit/rest") inside the async main() function as dynamic import() calls — the same pattern used in prototype/msal-analyzer/server/services/logAnalyzer.js

// Before — breaks with ESM-only packages
const { Octokit } = require("@octokit/rest");
const { AzureOpenAI } = require("openai");

async function main() { ... }

// After — works regardless of CJS/ESM package format
async function main() {
  const { Octokit } = await import("@octokit/rest");
  const { AzureOpenAI } = await import("openai");
  ...
}

Testing
No automated tests apply to workflow files. Validated locally that both packages load correctly via dynamic import() under Node 20.

Performance impact
None.

Documentation

• All relevant documentation is updated.

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