unify parallel 2D tree/p4est mesh rhs!

[ranocha]

See #1104 (comment)

[sloede]

Personally, I would have preferred to merge both versions to the first implementation, since it is the "main" routine and often helps new users to look at first, to understand what has changed compared to the serial version. But I'd be OK with it to be merged this way.

[ranocha]

Isn't that what I did here - using the ParallelTreeMesh{2} version, removing the implementation for the ParallelP4estMesh{2}?

[sloede]

Isn't that what I did here - using the ParallelTreeMesh{2} version, removing the implementation for the ParallelP4estMesh{2}?

You're right, my bad. Was only looking at line numbers, not filenames. Shouldn't review on the phone 😬

[codecov]

Codecov Report

Merging #1111 (a7f2aa8) into main (6d303b3) will increase coverage by 1.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1111      +/-   ##
==========================================
+ Coverage   95.70%   96.75%   +1.04%     
==========================================
  Files         303      303              
  Lines       23890    23876      -14     
==========================================
+ Hits        22863    23099     +236     
+ Misses       1027      777     -250     

Flag	Coverage Δ
unittests	96.75% <ø> (+1.04%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/solvers/dgsem_p4est/dg_2d_parallel.jl	100.00% <ø> (ø)
src/solvers/dgsem_tree/dg_2d_parallel.jl	100.00% <ø> (ø)
src/auxiliary/auxiliary.jl	97.67% <0.00%> (+0.17%)	⬆️
src/solvers/dgsem_p4est/containers.jl	95.59% <0.00%> (+0.74%)	⬆️
src/solvers/dgsem_p4est/dg_3d.jl	100.00% <0.00%> (+5.70%)	⬆️
examples/p4est_3d_dgsem/elixir_euler_sedov.jl	100.00% <0.00%> (+100.00%)	⬆️
...xamples/p4est_3d_dgsem/elixir_euler_free_stream.jl	100.00% <0.00%> (+100.00%)	⬆️
...es/p4est_3d_dgsem/elixir_mhd_shockcapturing_amr.jl	100.00% <0.00%> (+100.00%)	⬆️
...s/p4est_3d_dgsem/elixir_advection_nonconforming.jl	100.00% <0.00%> (+100.00%)	⬆️
...4est_3d_dgsem/elixir_euler_free_stream_extruded.jl	100.00% <0.00%> (+100.00%)	⬆️
... and 5 more

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