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Protect VKalVrt against negative track covariance

Merged Vadim Kostyukhin requested to merge (removed):VKalVrt_BadTrackCovar into 21.2

Introduce explicit protection against track covariance matrix with negative eigenvalues returned by AtlasExtrapolator. Presumably it happens due to material effects in track extrapolation when the vertex fitter tries to fit a fake vertex candidate.

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