#6027: replace remaining instances of ALL_t with Kokkos::ALL_t

[nmm0]

Fixes #6027

See #5807 and #5818

Also, I did a grep:

git grep -n -v "Kokkos::ALL_t" | grep "ALL_t"

The only instances found are the actual struct ALL_t so I'm fairly sure this is the last of them.

core/src/impl/Kokkos_ViewMapping.hpp:290:struct ALL_t {
core/src/impl/Kokkos_ViewMapping.hpp:292:  constexpr const ALL_t& operator()() const { return *this; }
core/src/impl/Kokkos_ViewMapping.hpp:295:  constexpr bool operator==(const ALL_t&) const { return true; }
core/src/impl/Kokkos_ViewMapping.hpp:300:// TODO This alias declaration forces us to fully qualify ALL_t inside the
core/src/impl/Kokkos_ViewMapping.hpp:302:// fully-qualified name when we remove Kokkos::Impl::ALL_t.
core/src/impl/Kokkos_ViewMapping.hpp:468:  // ALL_t

Maybe this should also be for the patch release?