Disable `Scheduled` workflow on forks #27

Job	Run time
Get Scarb versions	10s
test-forge-unit-and-integration (2.7.1)	13m 58s
test-cast (2.7.1)	13m 26s
test-forge-unit-and-integration (2.8.5)	18m 8s
test-forge-e2e (2.7.1)	20m 10s
test-cast (2.8.5)	17m 48s
test-forge-unit-and-integration (2.9.1)	21m 45s
test-forge-e2e (2.8.5)	20m 20s
test-cast (2.9.1)	18m 18s
test-forge-unit-and-integration (2.9.2)	21m 29s
test-forge-e2e (2.9.1)	21m 3s
test-cast (2.9.2)	22m 12s
test-forge-e2e (2.9.2)	21m 40s
notify_if_failed	0s
	3h 50m 27s

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