KEP-2170: Adding validation webhook for v2 trainjob #1623

Job	Run time
integration-test (v1.29.2, none, 3.10)	18m 39s
integration-test (v1.27.11, none, 3.11)	19m 9s
integration-test (v1.28.7, none, 3.8)	17m 8s
integration-test (v1.29.2, scheduler-plugins, 3.9)	16m 34s
integration-test (v1.27.11, scheduler-plugins, 3.10)	16m 24s
integration-test (v1.28.7, scheduler-plugins, 3.11)	17m 42s
integration-test (v1.29.2, volcano, 3.8)	22m 56s
integration-test (v1.27.11, volcano, 3.9)	16m 5s
integration-test (v1.28.7, volcano, 3.10)	16m 25s
	2h 41m 2s

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