TST: dask compute pytest fixture

[rcomer]

📰 Custom Issue

#5638 added a pytest fixture to mock-wrap dask's compute function:

iris/lib/iris/tests/unit/analysis/stats/test_pearsonr.py

Lines 44 to 55 in fe46e05

	@pytest.fixture
	def mocked_compute(self, monkeypatch):
	m_compute = mock.Mock(wraps=dask.base.compute)
	# The three dask compute functions are all the same function but monkeypatch
	# does not automatically know that.
	# https://stackoverflow.com/questions/77820437
	monkeypatch.setattr(dask.base, dask.base.compute.__name__, m_compute)
	monkeypatch.setattr(dask, dask.compute.__name__, m_compute)
	monkeypatch.setattr(dask.array, dask.array.compute.__name__, m_compute)
	return m_compute

If this fixture were moved to a conftest.py, it could also be used in test__arith__dask_array.py and test_broadcast_to_shape.py, where a more specific implementation is currently used.

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[ESadek-MO]

I think this should be a small change, and would neatly demonstrate the new PyTest style guide. I think we should do this!