branch-4.1: [fix](exec) Return Thrift DATETIME as naive Arrow timestamp #67232 - #67299
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Thrift external scanner responses encoded Doris `DATETIME` values with
the BE session timezone in the Arrow schema. This made clients interpret
wall-clock values as instants and could introduce an eight-hour offset.
The MemoryScratch sink now uses the existing naive-timestamp conversion
for `DATETIMEV2`, while preserving timezone-aware `TIMESTAMPTZ`
behavior.
### Release note
`DATETIME` values returned through the Thrift external scanner are
represented as timezone-naive Arrow timestamps.
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yiguolei
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Aug 29, 2026
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Cherry-picked from #67232