E2E Test with Katib UI, random search, and postgres

Introduced error constants and replaced reflect with cmp #612

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Run time

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Job	Run time
e2e (v1.25.12)	17m 7s
e2e (v1.26.6)	16m 16s
e2e (v1.27.3)	16m 19s
	49m 42s