DRAFT: Update GPU passthrough tests (BugFix)

[pedro-avalos]

Description

• Replaces mixbench with gpu-burn
  • mixbench is not building for newer versions of CUDA or newer architectures
  • Since the test is just for NVIDIA GPUs at the moment, we can use gpu-burn, which we already use to test the GPU without passthrough
• Runs test once instead of re-running and taking average time
• Added missing environ section for LXDVM passthrough job (see Add ability to customize VM specs in LXD VM GPU Passthrough test (Bugfix) #2007)

Resolved issues

• Resolves CHECKBOX-2020

Documentation

Tests

• Updated unit tests
• TODO: Run checkbox on lab device and add submission

[codecov]

Codecov Report

❌ Patch coverage is 81.81818% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 52.80%. Comparing base (4226836) to head (7dc1e40).

Files with missing lines	Patch %	Lines
checkbox-support/checkbox_support/lxd_support.py	42.85%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2136      +/-   ##
==========================================
- Coverage   52.82%   52.80%   -0.02%     
==========================================
  Files         395      395              
  Lines       42619    42610       -9     
  Branches     7902     7901       -1     
==========================================
- Hits        22513    22500      -13     
- Misses      19304    19308       +4     
  Partials      802      802              

Flag	Coverage Δ
checkbox-support	65.19% <42.85%> (-0.04%)	⬇️
provider-gpgpu	92.85% <100.00%> (-0.29%)	⬇️

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