[Backport 7.x] Only create final MatrixStatsResults on final reduction #39205
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MatrixStatsResults is the "final" result object, and runs an additional computation in it's ctor to calculate covariance, etc. This means it should only run on the final reduction instead of on every reduce.
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MatrixStatsResults is the "final" result object, and runs an additional
computation in it's ctor to calculate covariance, etc. This means
it should only run on the final reduction instead of on every reduce.
Backport of #38130