T8codeMesh: Switching to t8_cmesh_new_brick_{2,3}d.

[jmark]

Title says it all. This PR can only be merged after a new t8code release including PR DLR-AMR/t8code#1047.

[github-actions]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.37%. Comparing base (2a4d266) to head (ca52cf6).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1939      +/-   ##
==========================================
- Coverage   96.38%   96.37%   -0.00%     
==========================================
  Files         480      480              
  Lines       37859    37855       -4     
==========================================
- Hits        36487    36482       -5     
- Misses       1372     1373       +1     

Flag	Coverage Δ
unittests	96.37% <100.00%> (-<0.01%)	⬇️

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[benegee]

Ignoring the invalidations test, everything seems alright!

[ranocha]

It looks like this is not broken anymore, correct? Could you please fix the comment?

[ranocha]

@jmark @benegee You can do that in one of your new PRs working on T8code stuff in Trixi.jl

[jmark]

The story behind this is a bit more involved. We will elaborate the comment a bit more.