E2E Test with Katib UI, random search, and postgres

Migrate to GPSampler from skopt for bayesianoptimization #1323

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Run time

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Job	Run time
e2e (v1.29.2)	14m 29s
e2e (v1.30.7)	14m 52s
e2e (v1.31.3)	14m 7s
	43m 28s