[OpenMP] Corrects the setting of the Static_Steal schedule with `omp_set_schedule` (#227236)

Static-steal is considered a valid OMP scheduler by `kmp_runtime.cpp`'s
`__kmp_set_schedule` function. But when trying pass it to the setter, we
end up with a failure because it was not added to the `__kmp_sch_map` in
`kmp_global.cpp`.

This PR adds a test that each schedule in `kmp.h` can be set and gotten
by `omp_set_schedule` and `omp_get_schedule`, which fails with static
steal and a fix for `__kmp_sch_map`. To deal with static-steal set this
way with `ordered` loops, I added similar handling as with setting
static steal as an environment variable: gets converted to dynamic,
nonmonotonic when initialising the loop, so when combined with `ordered`
simply dynamic scheduling is used. A test that static-steal with
`ordered` works was added, which used to hang before adding this
handling.

This PR was made with AI assitance. All code was reviewed and where
necessary modified by myself.

GitOrigin-RevId: 1f48c2f8f4021f016a62fe0cebf877c4c8f5dffd