fix: use asyncio.sleep in async _retry_with_backoff #8706
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The
_retry_with_backofffunction injupyter.pywas usingtime.sleep, which blocks the event loop when called from the asyncjupyter_executefunction.This commit replaces the synchronous
_retry_with_backoffwith an asynchronous version that usesasyncio.sleepto prevent blocking the event loop. Thejupyter_executefunction has been updated to be async and use the new retry logic.I also fixed a bug where newline characters were being escaped in f-strings.