Pytato exec: don't wait #1766

Job	Run time
Ruff	5s
Typos	4s
Documentation	1m 49s
Pylint	1m 41s
Mypy	1m 43s
Examples Conda Py3	1m 21s
Pytest Conda Py3 Intel	2m 3s
Pytest Conda Py3 POCL	2m 15s
Tests for downstream project meshmode	11m 31s
Tests for downstream project grudge	10m 2s
Tests for downstream project mirgecom	2s
Tests for downstream project mirgecom_examples	3s
	32m 39s

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