[TRM] move transport porosity to medium

Jörg Buchwaldrequested to merge
joergbuchwald/ogs:fixTransportPorosity into master

move transport porosity to medium as required by MPL

  1. Feature description was added to the changelog
  2. Tests covering your feature were added?
  3. Any new feature or behavior change was documented?
Edited by Jörg Buchwald

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