chore: Allow parameterizing employee scheduling demo data #4

Job	Run time
build-quarkus (java/conference-scheduling, 17)	4m 47s
build-quarkus (java/bed-allocation, 17)	4m 44s
build-enterprise-quarkus (java/bed-allocation, 17)	4m 50s
build-enterprise-quarkus (java/vehicle-routing, 17)	4m 46s
build-quarkus (java/facility-location, 17)	4m 48s
build-quarkus (java/flight-crew-scheduling, 17)	4m 46s
build-quarkus (java/employee-scheduling, 17)	4m 46s
build-quarkus (java/food-packaging, 17)	4m 46s
build-quarkus (java/maintenance-scheduling, 17)	4m 46s
build-quarkus (java/meeting-scheduling, 17)	4m 46s
build-quarkus (java/project-job-scheduling, 17)	4m 44s
build-quarkus (java/order-picking, 17)	4m 46s
build-quarkus (java/school-timetabling, 17)	4m 45s
build-quarkus (java/sports-league-scheduling, 17)	4m 45s
build-quarkus (java/task-assigning, 17)	4m 49s
build-quarkus (java/tournament-scheduling, 17)	4m 46s
build-quarkus (java/vehicle-routing, 17)	4m 46s
build-quarkus (kotlin/school-timetabling, 17)	4m 42s
build-spring-boot (java/spring-boot-integration, 17)	4m 43s
	1h 30m 31s

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