There was an issue with Fides crashing because it attempted to allocate
memory with HIP before HIP was initialized. (See
vtk/fides#26.) The problem was
actually with VTK-m. (Initializing VTK-m is supposed to be optional,
but HIP was not getting initialized in time if it was not.) To fix
the Fides issue, update VTK-m to the changes provided by
vtk/vtk-m!3289.

Nothing used it in VTK, so remove it.

When using Kokkos, some Kokkos devices/backends require enabling a
language (such as CUDA or HIP). Previously, this required users to set a
variable named `VTK_KOKKOS_BACKEND` to an appropriate value. This has
been simplified by getting the Kokkos backends directly from the Kokkos
configuration so that the compilers are set up automatically.

Missing some fmt 11 includes

- closes #19470

- glew has been replaced by glad.

- closes #18547
- closes #19383
- Use glad instead of glew for loading GL extension functions
because GLEW has trouble using GLX and EGL in the same build.
- Replaces the VTK::glew module with VTK::glad.
- Removed the utility VTK::opengl module because it is unnecessary
after the changes made to vtkOpenGLOptions.cmake
- OpenGL is now loaded at runtime in desktop platforms.
- For mobile and webassembly, when VTK_OPENGL_USE_GLES is ON,
glad finds and links to the OpenGL::GLES3 library.
- Support for OSMesa is always available from VTK. Users must make
sure the libOSMesa.so or osmesa.dll is installed.
- Support for EGL is always available from VTK in Linux and Android.
Users must make sure libEGL is installed.
- On platforms where multiple render window backends are possible, the
vtkOpenGLRenderWindow is made the default factory override and it's
New method implements runtime tests to determine what render windows
can work. It basically const...

- brings in the change which makes gl2ps use vtk glad
  GL header instead of system GL header

… so we can start updating it properly.

Fix warnings detected by gcc 14 when building with
```
SET(CMAKE_CXX_FLAGS "-Wall -Wextra -Wshadow -Woverloaded-virtual -Wno-deprecated -Wno-strict-overflow -Wno-array-bounds -Wunreachable-code -fdiagnostics-color=always -Wstringop-overflow -Wstringop-overread" CACHE STRING "")
SET(CMAKE_C_FLAGS "-Wall -Wextra -Wshadow" CACHE STRING "")
```

The fixes are mostly about shadowed variables and methods