Add support for AMDGPU

[vchuravy]

• Use AMDGPU v2
• Symbol support Support symbols in arrays JuliaGPU/AMDGPU.jl#796
• Setup CI

Reverts #2485

[github-actions]

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Project coverage is 94.73%. Comparing base (a9cf615) to head (3c2254b).

Files with missing lines	Patch %	Lines
ext/TrixiAMDGPUExt.jl	0.00%	6 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2486       +/-   ##
===========================================
+ Coverage   79.36%   94.73%   +15.37%     
===========================================
  Files         509      510        +1     
  Lines       42069    42113       +44     
===========================================
+ Hits        33387    39895     +6508     
+ Misses       8682     2218     -6464     

Flag	Coverage Δ
unittests	94.73% <0.00%> (+15.37%)	⬆️

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[ranocha]

Thanks! I will leave a review requesting changes so that nobody accidentally merges this PR.

[ranocha]

Could you please bring back the code re-added in this PR? It seems to be gone in the GitHub web interface.