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downgrade DiffFromCache log level for cache-miss errors ( 26185)

downgrade DiffFromCache log level for cache-miss errors ( 26185): a task in rh-swe-bench (Harbor dataset). Title: DiffFromCache logs cache-miss errors at ERROR level, producing noisy and misleading log output

The task

**Title:** DiffFromCache logs cache-miss errors at ERROR level, producing noisy and misleading log output

Part of rounakbende/rh-swe-bench.