Fix normal traction BC line element normal computation

Dmitri Naumovrequested to merge
endJunction/ogs:FixNormalTraction into master

Now normal is pointing out w.r.t. to the bulk element.

  • Rewritten the normal direction computation for lines using cross-product.
  • Fixed normalization for the surface elements.

Fixes #3565 (closed)

Edited by Dmitri Naumov

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