[Misc] Retry HF processing if "Already borrowed" error occurs

[DarkLight1337]

Purpose

I've noticed that when using fast tokenizer inside HF processor, there is a chance that "Already borrowed" error (huggingface/tokenizers#537) can occur under high concurrency. Instead of failing the request immediately, it makes more sense to retry the HF processor after a short delay.

Test Plan

Test Result

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[gemini-code-assist]

Code Review

This pull request introduces a retry mechanism for Hugging Face processor calls when an "Already borrowed" error occurs, which can happen under high concurrency. The change is well-targeted to solve this specific issue. My review includes a critical fix to prevent a potential IndexError from unhandled exceptions and a suggestion to adjust the logging level for transient errors to reduce log noise in production environments.