Remove dependency on CUDA_Runtime_jll in test/ environment

[giordano]

Repeat of #4671. This was originally introduced in #3880 (comment), but I don't understand the motivation very well, might just be a problem which happened back then and has been resolved since. I removed this dependency in #5458, and tests still passed (all tests also passed in #4671). Close #5465

[navidcy]

I don't think the comment at the top will automatically close the #5465 (since it's a PR, not an issue). We'll just have to manually close that.

[giordano]

It does work also with PRs. Example from yesterday: NumericalEarth/Breeze.jl#333 (comment)

[glwagner]

I don't think the comment at the top will automatically close the #5465 (since it's a PR, not an issue). We'll just have to manually close that.

very bold to challenge @giordano on github mechanics

[navidcy]

The AMDGPU tests are hanging (or in a long queue).
They seem irrelevant for this PR anyway.
Happy to merge!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.37%. Comparing base (b706e8f) to head (47d7769).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5466      +/-   ##
==========================================
- Coverage   73.77%   73.37%   -0.40%     
==========================================
  Files         400      400              
  Lines       22871    22871              
==========================================
- Hits        16872    16781      -91     
- Misses       5999     6090      +91     

Flag	Coverage Δ
buildkite	68.94% <ø> (+<0.01%)	⬆️
julia	68.94% <ø> (+<0.01%)	⬆️
reactant_1	6.45% <ø> (?)
reactant_2	10.44% <ø> (ø)
reactant_3	9.57% <ø> (ø)

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