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MPI for 2D parabolic system on conforming P4est mesh  (#2886)

* enabled MPI for 2D parabolic system on P4est mesh (from present main)

* adapted naming: viscous -> parabolic

* added assertion to ensure no mortars are present

* cleanup style

* increased allocation limit (checked similar allocations in MPI as hyperbolic communication, now just 3 x communication)

* Apply suggestions from code review

Removed dispatch to unsupoorted T8codeMeshParallel

Co-authored-by: Daniel Doehring <doehringd2@gmail.com>

* added comments to clarify sign-flip

* extended comment on orientation_factor

* renamed surface integral MPI accumulate

* Apply suggestions from code review

adhere to mpi internal functions

Co-authored-by: Hendrik Ranocha <ranocha@users.noreply.github.com>

* removed unnecessary function

* moved mpi send to end

* Apply suggestions from code review

applied suggested comment improvments

Co-authored-by: Daniel Doehring <doehringd2@gmail.com>

* formatting applied

* added name to Authors

* Apply suggestions from code review

* Update src/solvers/dgsem_p4est/dg_2d_parabolic_parallel.jl

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Co-authored-by: TJP-Karpowski <MessageInGitHubPlease>
Co-authored-by: Daniel Doehring <doehringd2@gmail.com>
Co-authored-by: Hendrik Ranocha <ranocha@users.noreply.github.com>
Co-authored-by: Michael Schlottke-Lakemper <michael@sloede.com>

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