Fix Master Label for PyTorchJob #738

Job	Run time
integration-test (v1.26.6, none, 3.10)	22m 19s
integration-test (v1.27.3, none, 3.7)	21m 47s
integration-test (v1.25.11, none, 3.8)	22m 24s
integration-test (v1.26.6, scheduler-plugins, 3.9)	25m 58s
integration-test (v1.27.3, scheduler-plugins, 3.10)	25m 0s
integration-test (v1.25.11, scheduler-plugins, 3.10)	24m 28s
integration-test (v1.26.6, volcano, 3.9)	25m 43s
integration-test (v1.27.3, volcano, 3.10)	24m 22s
integration-test (v1.25.11, volcano, 3.10)	24m 15s
	3h 36m 16s

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