KEP-2170: Adding validation webhook for v2 trainjob #1618

Job	Run time
integration-test (v1.29.2, none, 3.10)	10m 41s
integration-test (v1.27.11, none, 3.11)	10m 40s
integration-test (v1.28.7, none, 3.8)	10m 38s
integration-test (v1.29.2, scheduler-plugins, 3.9)	10m 35s
integration-test (v1.27.11, scheduler-plugins, 3.10)	10m 37s
integration-test (v1.28.7, scheduler-plugins, 3.11)	10m 38s
integration-test (v1.29.2, volcano, 3.8)	10m 37s
integration-test (v1.27.11, volcano, 3.9)	10m 32s
integration-test (v1.28.7, volcano, 3.10)	10m 38s
	1h 35m 36s

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