[SDK] Add information about TrainingClient logging #770

Job	Run time
integration-test (v1.26.6, none, 3.10)	24m 10s
integration-test (v1.27.3, none, 3.7)	21m 45s
integration-test (v1.25.11, none, 3.8)	23m 29s
integration-test (v1.26.6, scheduler-plugins, 3.9)	24m 31s
integration-test (v1.27.3, scheduler-plugins, 3.10)	24m 10s
integration-test (v1.25.11, scheduler-plugins, 3.10)	24m 48s
integration-test (v1.26.6, volcano, 3.9)	25m 32s
integration-test (v1.27.3, volcano, 3.10)	24m 11s
integration-test (v1.25.11, volcano, 3.10)	24m 33s
	3h 37m 9s

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