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Use mBF smoother in ACTS track finding

Andreas Stefl requested to merge astefl/athena:acts-tf-use-mbf-smoother into main

The mBF smoother was added with https://github.com/acts-project/acts/pull/3420 in ACTS and seems to improve the CPU time spent in smoothing by a factor of ~2.5. We can directly benefit by that in the ACTS track finding by replacing the default GainMatrixSmoother with the new MbfSmoother.

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