Pytato exec: don't wait #1765

Job	Run time
Ruff	5s
Typos	3s
Documentation	1m 49s
Examples Conda Py3	1m 25s
Tests for downstream project meshmode	12m 25s
Mypy	1m 42s
Pylint	1m 34s
Tests for downstream project grudge	9m 57s
Tests for downstream project mirgecom	3s
Tests for downstream project mirgecom_examples	5s
Pytest Conda Py3 Intel	2m 24s
Pytest Conda Py3 POCL	2m 21s
	33m 53s

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