E2E Test with simple-pbt

[WIP] Add e2e test for `tune` api with LLM hyperparameter optimization #1068

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Run time

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Job	Run time
e2e (v1.27.11, simple-pbt)	1m 24s
e2e (v1.28.7, simple-pbt)	1m 24s
e2e (v1.29.2, simple-pbt)	1m 23s
	4m 11s