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[VECGEOM-431] Fix to DistToOut() bug for point on surface and direction is almost parallel to surface

Guilherme Lima requested to merge lima/vecgeom-431 into master

Fix was to modify the "on surface" condition from distIn to safetyOut. As suggested, I also introduced some optimization changes as a full distIn calculation is not needed, and a separate invDirection was not saving time.

A similar "point on surface with almost-parallel direction" also affected distanceToIn() function, and I also fixed that, althout in that case it was not possible to eliminate the need for distToOut.

Testing cases added to unit test.

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