Fix flaky `test_reductions_2D` (#9037)
Fix flaky `test_reductions_2D` (#9037)

`prod`/`nanprod` overflow for data at this size. It's not clear why
numpy only raises these warnings _sometimes_, but it makes sense why
they're there. We filter `RuntimeWarning` now for `prod`/`nanprod` (and
only these operations) now to fix this.
dask/dask,jakirkham/dask,dask/dask,jakirkham/dask