Fix iteration in TestStepSourceLocationCache #20451

Job	Run time
Download Replay browser	5s
Generate Test Run ID	6s
Wait for Vercel Preview Branch	3m 8s
Unit Tests	1m 29s
End-to-end tests (1)	3m 21s
Authenticated end-to-end tests (1)	7m 26s
End-to-end tests (2)	4m 54s
End-to-end tests (3)	4m 52s
End-to-end tests (4)	3m 13s
End-to-end tests (5)	4m 56s
End-to-end tests (6)	4m 45s
End-to-end tests (7)	6m 53s
End-to-end tests (8)	3m 47s
End-to-end tests (9)	5m 21s
End-to-end tests (10)	4m 53s
	59m 9s

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