Add Trixi2Vtk.jl to downstream tests

[sloede]

Requires trixi-framework/Trixi2Vtk.jl#79 to be merged first + a subsequent run of this PR to make sure that everything works as expected.

[github-actions]

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Created with ❤️ by the Trixi.jl community.

[ranocha]

Thanks! Looks good to me if tests pass later. We should also add the new downstream test to the required CI checks

[sloede]

We should also add the new downstream test to the required CI checks

👍

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (276dc3c) 74.61% compared to head (642a5dd) 76.21%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1722      +/-   ##
==========================================
+ Coverage   74.61%   76.21%   +1.60%     
==========================================
  Files         431      431              
  Lines       34600    34644      +44     
==========================================
+ Hits        25815    26401     +586     
+ Misses       8785     8243     -542     

Flag	Coverage Δ
unittests	76.21% <ø> (+1.60%)	⬆️

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see 49 files with indirect coverage changes

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[sloede]

Looks like the downstream tests pass and only execute the subset that is marked as an "upstream" test - LGTM from my side

[ranocha]

Thanks!