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TrkVertexFitters: Fix precision issue in test.

Scott Snyder requested to merge ssnyder/athena:test.TrkVertexFitters-20231120 into main

The AdaptiveMultiVertexFitter test was failing on arm. This is because the input covariance matrix for the vertex positions was set so large that we were losing all precision in the matrix inversion in KalmanVertexUpdator::positionUpdate.

Made the input more reasonable, and now we get consistent results between arm and x86.

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