Reintroduce old TmpFileSegmentWriteOutMedium #1
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Reintroduce old TmpFileSegmentWriteOutMedium
We make it a legacy option and give it a new name. It exists solely to give us something to roll back to in case the new logic causes problems that didn't previously exist. We should update the release notes to also indicate that this is being done and tell people to set the properties for the legacyTmpFile in case they have something that with memory usage and SegmentWriteOutMedium that breaks when upgrading.