tests.cuda fails to evaluate: "Function called without required argument "backendStdenv"

[trofi]

Describe the bug

Noticed the test evaluation failure when explored nixpkgs attributes for obvious instantiation mistakes.

The reproducer:

$ nix-instantiate '<nixpkgs>' -A tests.cuda
error:
       … while calling the 'abort' builtin

         at lib/customisation.nix:210:13:

          209|        # which is especially relevant with allowAliases = false
          210|        else abort "lib.customisation.callPackageWith: ${error}";
             |             ^
          211|

       error: evaluation aborted with the following error message: 'lib.customisation.callPackageWith: Function called without required argument "backendStdenv" at pkgs/test/cuda/cuda-library-samples/generic.nix:3'

Expected behavior

The test set should instantiate successfully.

Notify maintainers

@ConnorBaker @samuela @SomeoneSerge

Metadata

[user@system:~]$ nix-shell -p nix-info --run "nix-info -m"
 - system: `"x86_64-linux"`
 - host os: `Linux 6.6.10, NixOS, 24.05 (Uakari), 24.05.20240111.be34eb4`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.19.2`
 - channels(root): `""`
 - channels(slyfox): `""`
 - nixpkgs: `/run/current-system/sw/share/nixos-flakes/inputs/nixpkgs`

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[SomeoneSerge]

Oh, again, CC #279684 #279703 @NixOS/cuda-maintainers

The immediate error is that this should be cudaPackages_XX.callPackage, not pkgs.callPackage. That said though, the samples are already part of the cudaPackages scope, e.g. cudaPackages_11_8.cuda-library-samples. As mentioned in the referenced issue, we should move them out of pkgs/tests bc right now cudaPackages weirdly depend on pkgs/tests and they shouldn't

[SomeoneSerge]

#280386