KEP-2170: Add unit and E2E tests for model and dataset initializers #1692

Job	Run time
integration-test (v1.29.2, none, 3.10)	18m 17s
integration-test (v1.27.11, none, 3.11)	18m 26s
integration-test (v1.28.7, none, 3.8)	18m 17s
integration-test (v1.29.2, scheduler-plugins, 3.9)	17m 54s
integration-test (v1.27.11, scheduler-plugins, 3.10)	15m 55s
integration-test (v1.28.7, scheduler-plugins, 3.11)	16m 21s
integration-test (v1.29.2, volcano, 3.8)	17m 54s
integration-test (v1.27.11, volcano, 3.9)	16m 50s
integration-test (v1.28.7, volcano, 3.10)	16m 49s
	2h 36m 43s

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