colexec: close the ordered sync used by the external sorter #75771
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colexec: close the ordered sync used by the external sorter
Previously, we forgot to close the ordered synchronizer that is used by
the external sorter to merge already sorted partitions. This could
result in some tracing spans never being finished and is now fixed.
Release note: None
colexec: return an error rather than logging it on Close in some cases
This error eventually will be logged anyway, but we should try to
propagate it up the stack as much as possible.
Release note: None