Sort predicates in codegen so they are consistent in parallel #3409

Job	Run time
Tests for downstream project Firedrake	2m 43s
Conda Examples	1m 55s
Documentation	1m 37s
Mypy	1m 44s
Tests for downstream project arraycontext	2m 33s
Pylint	1m 41s
Tests for downstream project meshmode	11m 4s
Conda Pytest (ubuntu-latest)	3m 59s
Conda Pytest with Intel CL	3m 47s
Tests for downstream project grudge	10m 34s
Conda Pytest without arg check	3m 58s
Conda Pytest (macos-latest)	3m 50s
Tests for downstream project pytential	47m 22s
Conda Pytest Twice (for cache behavior)	5m 26s
Tests for downstream project pytato	6m 22s
Ruff	5s
Typos	5s
Validate CITATION.cff	7s
	1h 48m 52s

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