Improve GPU selection

[philogicae]

Self proofreading checklist

• The new code clear, easy to read and well commented.
• New code does not duplicate the functions of builtin or popular libraries.
• An LLM was used to review the new code and look for simplifications.
• New classes and functions contain docstrings explaining what they provide.
• All new code is covered by relevant tests.

TODO

• Better CRN x GPU selection (all at once)
• Rework on GPU tests
• Minor fixes & improvements

Changes

Before: Choose CRN, then GPU device

After: Choose target CRN + GPU device all at once

[github-actions]

Failed to retrieve llama text: POST 500: 500: Unhandled error during initialisation

[codecov]

Codecov Report

Attention: Patch coverage is 69.38776% with 15 lines in your changes missing coverage. Please review.

Project coverage is 60.44%. Comparing base (41575ac) to head (dcb6caf).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/aleph_client/commands/instance/__init__.py	77.50%	5 Missing and 4 partials ⚠️
src/aleph_client/commands/instance/display.py	33.33%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #342      +/-   ##
==========================================
+ Coverage   58.68%   60.44%   +1.75%     
==========================================
  Files          18       18              
  Lines        3113     3107       -6     
  Branches      430      429       -1     
==========================================
+ Hits         1827     1878      +51     
+ Misses       1065     1010      -55     
+ Partials      221      219       -2     

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[github-actions]

Failed to retrieve llama text: POST 500: 500: Unhandled error during initialisation