[CHerryPick:r2.5] Keras Training API: Make sure to update the stateful metrics in the Progbar once the MetricsContainer is built so the metrics are not averaged over an epoch. #48707
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Fixes #47099
Unit test element courtesy of the reporter of #47099.
PiperOrigin-RevId: 369572207
Change-Id: I308fcccac5164ab92a70e74d27ecd0f0cbba275a