KEP-2170: Add unit and E2E tests for model and dataset initializers #1702

Job	Run time
integration-test (v1.29.2, none, 3.10)	17m 35s
integration-test (v1.27.11, none, 3.11)	16m 21s
integration-test (v1.28.7, none, 3.8)	18m 50s
integration-test (v1.29.2, scheduler-plugins, 3.9)	17m 41s
integration-test (v1.27.11, scheduler-plugins, 3.10)	15m 19s
integration-test (v1.28.7, scheduler-plugins, 3.11)	18m 17s
integration-test (v1.29.2, volcano, 3.8)	18m 3s
integration-test (v1.27.11, volcano, 3.9)	17m 14s
integration-test (v1.28.7, volcano, 3.10)	15m 39s
	2h 34m 59s

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