LBANN SW stack packages: gcc-toolchain and clang support (#28769)

* Added support to LBANN, Hydrogen, DiHydrogen, and Aluminum to capture
  a gcc-toolchain cxxflags argument and pass it to a CMAKE_CUDA_FLAG
  argument when set.  This helps deal with compiling with clang on
  systems with old base gcc installations.
* Added a dependency on py-scipy when enabling tests on LBANN.
* Updated the C++ standard for Hydrogen to C++17.
* Added a new variant +apps to enable (or disable) python packages that
  are used by applications in the LBANN repo, but are not strictly
  required for building and using LBANN.
* Added a run time dependency for both py-pytest and py-scipy so that
  they are activated in any environment.
* Added support for building LBANN, Hydrogen, and DiHydrogen with the
  IBM ESSL BLAS library.  This requires explicit identification of
  additional LAPACK libraries, since ESSL does not implement LAPACK, but
  is found by CMake.
* Fixed a bug in the LBANN dependency on OpenCV for Power architectures.
  The +powerpc variant is only required for GCC toolchains and causes
  Clang to break. Switched to only enabling when using %gcc on power.

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