Fix file upload 'Something went wrong' error by sending the invoke
acknowledgement before performing the file upload, rather than after.
Changes:
- Move invokeResponse to fire immediately upon receiving fileConsent/invoke
- Handle file upload asynchronously without blocking the response
- Update test to wait for async upload completion using vi.waitFor
This prevents Teams from timing out while waiting for the HTTP 200
acknowledgement during slow file uploads to OneDrive.
Fixes#27632
09f4abdd61