E2E Test with Katib UI, random search, and postgres

Add unit test for `create_experiment` in the `katib_client` module #722

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Run time

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Job	Run time
e2e (v1.27.11)	16m 20s
e2e (v1.28.7)	16m 14s
e2e (v1.29.2)	16m 47s
	49m 21s