Fix CLANG_FORMAT_EXECUTABLE location with find_program to address:

CMake Error at CMake/ITKClangFormatSetup.cmake:62 (message):
  Missing suitable clang-format executable, set CLANG_FORMAT_EXECUTABLE
  variable to version 8.0
Call Stack (most recent call first):
  CMakeLists.txt:586 (include)

Improve host system detection for the clang-format binary download.

Addresses:

  3.29.0/share/cmake/Modules/CMakeDependentOption.cmake:89 (message):
    Policy CMP0127 is not set: cmake_dependent_option() supports full Condition
    Syntax.  Run "cmake --help-policy CMP0127" for policy details.  Use the
    cmake_policy command to set the policy and suppress this warning.
  Call Stack (most recent call first):
    CMakeLists.txt:107 (cmake_dependent_option)
  This warning is for project developers.  Use -Wno-dev to suppress it.

Submitted upstream:

  zlib-ng/zlib-ng#1709

Addresses:

  ld: warning: ignoring duplicate libraries: '-lm'

With Apple Clang 15. This approach works with older CMake but based on:

  https://gitlab.kitware.com/cmake/cmake/-/commit/7b99c42e57b11afe818827ac537ca020c020addd

Slight differences on this platform.

Uses new GitHub Actions dashboard script