Removing assignment of service-account for launcher #585

Job	Run time
integration-test (v1.26.6, none, 3.10)	18m 5s
integration-test (v1.27.3, none, 3.7)	22m 15s
integration-test (v1.25.11, none, 3.8)	20m 6s
integration-test (v1.26.6, scheduler-plugins, 3.9)	25m 12s
integration-test (v1.27.3, scheduler-plugins, 3.10)	24m 36s
integration-test (v1.25.11, scheduler-plugins, 3.10)	25m 2s
integration-test (v1.26.6, volcano, 3.9)	20m 22s
integration-test (v1.27.3, volcano, 3.10)	19m 18s
integration-test (v1.25.11, volcano, 3.10)	23m 9s
	3h 18m 5s

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