PyOpenCLActx: fixes to np.where, actx.to_numpy #2040

Job	Run time
Pytest Conda Py3 Intel	2m 6s
Typos	7s
basedpyright	1m 43s
Pytest Conda Py3 POCL	2m 33s
Tests for downstream project grudge	12m 9s
Ruff	9s
Tests for downstream project meshmode	10m 57s
Documentation	1m 36s
Tests for downstream project mirgecom	5s
Tests for downstream project mirgecom_examples	6s
Examples Conda Py3	1m 25s
	32m 56s

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