Fix: seed sequence permutation tests and make results independent of n_jobs

[selmanozleyen]

Fixes: #1233 and #1232 as a side effect.

For each permutation we have a separate seed. The seeds are generated by SeeqSequence(root_seed).spawn(x) routine. This will prevent having correlated results from sequential seeds mentioned in the numpy docs. I tried to use the best practice but since we need to use numba in the future our seeds can be only Sequence[int], instead of Sequence[np.random.SeedSequence]. Hence:

def _spawn_seeds(seed: int | None, n: int) -> list[int]:
    # uint32 integer seeds, derived from independent SeedSequence children (avoids the correlation
    # of sequential seeds). uint32 is required to stay reproducible with numba/legacy RandomState,
    # which only accept uint32 integer seeds.
    return [int(s.generate_state(1)[0]) for s in np.random.SeedSequence(seed).spawn(n)]

Once you confirm. I will write warnings in docstrings and in notebooks about this behavioral change to users.