Filter out --help from argv when initializing Kokkos

[bangerth]

Fixes #15456. Alternative to #15464.

[tamiko]

I prefer this version. I think there is little harm in passing argc, argv down to kokkos given the fact that kokkos has a separate --kokkos-* namespace for arguments. For example, the kokkos help message is still available via --kokkos-help.

The problem comes with interpreting non-namespaced arguments such as --help.

[tamiko]

I think we have sufficient consensus.

[kronbichler]

As expressed in #15456, I agree with this setting. I am not sure if it is the solution we will have long-term, but for now I think this addresses the most pressing issue.

[peterrum]

I also don't think this is the perfect solution. Working with additional datas as in the rest of the library would probably make more sense. At least --help works again 👍 However, since MPI_InitFinalize is (still) not well documented, we can still changes this while keeping backwards compatibility.