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Handle `upstream_http_error` completion responses (#34573)

Addresses upstream errors such as:
<img width="831" height="100" alt="Screenshot 2025-07-16 at 3 37 03 PM"
src="https://github.com/user-attachments/assets/2aeb0257-6761-4148-b687-25fae93c68d8"
/>

These should now automatically retry like other upstream HTTP error
codes.

Release Notes:

- N/A
b4c2ae5196Richard Feldman committed on 7/16/2025, 8:31:31 PM· committed by GitHubparent0023773
1 file changedLine totals unavailable