KEP-2170: Adding validation webhook for v2 trainjob #1622

Job	Run time
integration-test (v1.29.2, none, 3.10)	16m 38s
integration-test (v1.27.11, none, 3.11)	16m 18s
integration-test (v1.28.7, none, 3.8)	17m 27s
integration-test (v1.29.2, scheduler-plugins, 3.9)	16m 31s
integration-test (v1.27.11, scheduler-plugins, 3.10)	16m 30s
integration-test (v1.28.7, scheduler-plugins, 3.11)	15m 59s
integration-test (v1.29.2, volcano, 3.8)	15m 48s
integration-test (v1.27.11, volcano, 3.9)	16m 16s
integration-test (v1.28.7, volcano, 3.10)	15m 42s
	2h 27m 9s

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