KEP-2170: Adding validation webhook for v2 trainjob #1621

Job	Run time
integration-test (v1.29.2, none, 3.10)	17m 14s
integration-test (v1.27.11, none, 3.11)	17m 17s
integration-test (v1.28.7, none, 3.8)	18m 47s
integration-test (v1.29.2, scheduler-plugins, 3.9)	16m 28s
integration-test (v1.27.11, scheduler-plugins, 3.10)	18m 10s
integration-test (v1.28.7, scheduler-plugins, 3.11)	17m 28s
integration-test (v1.29.2, volcano, 3.8)	15m 53s
integration-test (v1.27.11, volcano, 3.9)	16m 5s
integration-test (v1.28.7, volcano, 3.10)	16m 6s
	2h 33m 28s

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