Updated getAccessToken to respect AbortSignal and timeout correctly

[hhoughgg]

getAccessToken used spawnSync that stops abort signals being received and seems to timeout forever if you never make it to the accept page for access.

• Tests
  • [ x] Tests included/updated
  • Automated tests not possible - manual testing has been completed as follows:
  • Additional testing not necessary because:
• Public documentation
  • Cloudflare docs PR(s):
  • [ x] Documentation not necessary

---

[changeset-bot]

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Latest commit: 42945f1

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[devin-ai-integration]

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commit: 42945f1