Support self.service in ModularInput's validate_input #1090

Job	Run time
run-test-suite (ubuntu-22.04, 3.7, 9.1)	8m 49s
run-test-suite (ubuntu-latest, 3.9, latest)	10m 21s
run-test-suite (ubuntu-latest, 3.9, 9.4)	9m 6s
run-test-suite (ubuntu-latest, 3.13, latest)	10m 20s
	38m 36s

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