KEP-2170: Rename TrainingRuntimeRef to RuntimeRef API #1557

Job	Run time
integration-test (v1.29.2, none, 3.10)	6m 56s
integration-test (v1.27.11, none, 3.11)	6m 54s
integration-test (v1.28.7, none, 3.8)	6m 55s
integration-test (v1.29.2, scheduler-plugins, 3.9)	6m 54s
integration-test (v1.27.11, scheduler-plugins, 3.10)	6m 54s
integration-test (v1.28.7, scheduler-plugins, 3.11)	6m 55s
integration-test (v1.29.2, volcano, 3.8)	6m 53s
integration-test (v1.27.11, volcano, 3.9)	6m 55s
integration-test (v1.28.7, volcano, 3.10)	6m 55s
	1h 2m 11s

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