E2E Test with Katib UI, random search, and postgres

Introduced error constants and replaced reflect with cmp #583

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Run time

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Job	Run time
e2e (v1.25.12)	17m 24s
e2e (v1.26.6)	17m 15s
e2e (v1.27.3)	29m 7s
	1h 3m 46s