Add new test for 'MeshMaterial'

[grospelliergilles]

This test will focus on adding/removing a lot of materials/environments to check performance of this part of the framework.

[codecov]

Codecov Report

Patch coverage: 96.05% and project coverage change: +0.08 🎉

Comparison is base (4354e02) 72.21% compared to head (cc1ab2b) 72.29%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #788      +/-   ##
==========================================
+ Coverage   72.21%   72.29%   +0.08%     
==========================================
  Files        1628     1629       +1     
  Lines      122264   122413     +149     
==========================================
+ Hits        88287    88500     +213     
+ Misses      33977    33913      -64     

Impacted Files	Coverage Δ
...ceapart/src/arcane/tests/MaterialHeatTestModule.cc	96.05% <96.05%> (ø)

... and 6 files with indirect coverage changes

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