avoid duplication in PytatoJAXArrayContext.freeze #1888

Job	Run time
Ruff	7s
Typos	4s
Documentation	1m 39s
basedpyright	1m 47s
Examples Conda Py3	1m 30s
Tests for downstream project meshmode	11m 17s
Pytest Conda Py3 POCL	2m 22s
Tests for downstream project mirgecom	5s
Tests for downstream project grudge	10m 21s
Pytest Conda Py3 Intel	2m 22s
Tests for downstream project mirgecom_examples	6s
	31m 40s

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