feat: Stable AMVF KF fitting for examples (#2383)

I noticed that the AMVF KF becomes unstable in our current examples setup. The new initial covariance for the vertex seed seems to fix that
acts-project · Aug 19, 2023 · 9e93a42 · 9e93a42
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diff --git a/CI/physmon/reference/performance_amvf_orthogonal_hist.root b/CI/physmon/reference/performance_amvf_orthogonal_hist.root
diff --git a/CI/physmon/reference/performance_amvf_seeded_hist.root b/CI/physmon/reference/performance_amvf_seeded_hist.root
diff --git a/CI/physmon/reference/performance_amvf_truth_estimated_hist.root b/CI/physmon/reference/performance_amvf_truth_estimated_hist.root
diff --git a/CI/physmon/reference/performance_amvf_truth_smeared_hist.root b/CI/physmon/reference/performance_amvf_truth_smeared_hist.root
diff --git a/CI/physmon/reference/performance_amvf_ttbar_hist.root b/CI/physmon/reference/performance_amvf_ttbar_hist.root
diff --git a/Examples/Algorithms/Vertexing/src/AdaptiveMultiVertexFinderAlgorithm.cpp b/Examples/Algorithms/Vertexing/src/AdaptiveMultiVertexFinderAlgorithm.cpp
@@ -113,6 +113,7 @@ ActsExamples::AdaptiveMultiVertexFinderAlgorithm::executeAfterSeederChoice(
                                        m_cfg.bField);
   // We do not want to use a beamspot constraint here
   finderConfig.useBeamSpotConstraint = false;
+  finderConfig.looseConstrValue = 1e2;
   finderConfig.tracksMaxZinterval = 1. * Acts::UnitConstants::mm;
   finderConfig.maxIterations = 200;