[MPL/PL] unify phase_pressure -> gas_phase_pressure / liquid_phase_pressure

Jörg Buchwaldrequested to merge
joergbuchwald/ogs:rename_phase_pressure into master

Unify variable phase_pressure over all processes to allow for consistent use in 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 Dmitri Naumov

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