refactor: move cuda_arch require into packages.yaml packages:all section

Co-authored-by: wdconinc <4656391+wdconinc@users.noreply.github.com>

Author: Copilot

spack-environment/cuda/spack.yaml

@@ -2,7 +2,6 @@ spack:
   include:
   - ../concretizer.yaml
   - ../packages.yaml
-  - ../cuda_arch.yaml
   - ../packages_root_with_opengl.yaml
   - ../view.yaml
   concretizer:

spack-environment/cuda_arch.yaml

@@ -26,6 +26,8 @@ packages:
     #- any_of: [+ipo, '@:']
     - any_of: [build_system=cmake, '@:']
     - any_of: [build_type=Release, '@:']
+    - when: '+cuda'
+      any_of: [cuda_arch=75, '@:']
   abseil-cpp:
     require:
     # Without constraints on abseil-cpp, we end up with cxxstd=14 branches

spack-environment/packages.yaml

@@ -2,7 +2,6 @@ spack:
   include:
   - ../concretizer.yaml
   - ../packages.yaml
-  - ../cuda_arch.yaml
   - ../view.yaml
   concretizer:
     unify: when_possible  # py-numba needs a different llvm than the one provided as external