Do not perform prefetch for temp relations #548
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## Problem See https://neondb.slack.com/archives/C04DGM6SMTM/p1734002916827019 With recent prefetch fixes for pg17 and `effective_io_concurrency=100` pg_regress test stats.sql is failed when set temp_buffers to 100. Stream API will try to lock all this 100 buffers for prefetch. ## Summary of changes Disable such behaviour for temp relations. Postgres PR: neondatabase/postgres#548 Co-authored-by: Konstantin Knizhnik <knizhnik@neon.tech>
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