UFL CI

Fix `is_cellwise_constant(ReferenceGrad(x))` #1997

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Run time

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Job	Run time
build (ubuntu-latest, 3.8)	4s
build (ubuntu-latest, 3.9)	4s
build (ubuntu-latest, 3.10)	7s
build (ubuntu-latest, 3.11)	7s
build (ubuntu-latest, 3.12)	5s
build (macos-latest, 3.10)	7s
build (macos-latest, 3.11)	7s
build (macos-latest, 3.12)	7s
build (windows-latest, 3.11)	5s
	53s