E2E Test with Katib UI, random search, and postgres

[WIP] Add e2e test for `tune` api with LLM hyperparameter optimization #1158

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Run time

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Job	Run time
e2e (v1.27.11)	15m 43s
e2e (v1.28.7)	17m 52s
e2e (v1.29.2)	20m 4s
	53m 39s