ACTS KF: Use `MbfSmoother` in ACTS KF
Similar to what we did in the ACTS Track Finding we can make use of the MbfSmoother as an alternative to the GainMatrixSmoother to improve CPU performance.
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Similar to what we did in the ACTS Track Finding we can make use of the MbfSmoother as an alternative to the GainMatrixSmoother to improve CPU performance.