[query] Make pyToDF use long lived temp files (again) #14907
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It is possible that the partition function can outlive the ExecuteContext in TableValue.toDF. Therefore, any temporary files needed for future stages must still be around, so we need to set selfContainedExecution to false for pyToDF.
Fixes #Hail Query 0.2 support > MT to parquet throwing FileNotFoundException: Item not found @ 💬 reported by @ch-kr on Zulip.
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