[MLIR][OpenMP] Update op verifiers dependent on omp.wsloop (2/5) (#89211)

This patch updates verifiers for `omp.ordered`, `omp.ordered.region`,
`omp.cancel` and `omp.cancellation_point`, which check for a parent
`omp.wsloop`.

After transitioning to a loop wrapper-based approach, the expected
direct parent will become `omp.loop_nest` instead, so verifiers need to
take this into account.

This PR on its own will not pass premerge tests. All patches in the
stack are needed before it can be compiled and passes tests.