Test

statement,slowquery: add request unit part in list #1505

Job	Run time
Backend - Unit	47s
Backend - Unit	47s
Backend - Integration - TiDB@nightly	3m 4s
Backend - Integration - TiDB@nightly	3m 4s
Backend - Integration - TiDB@^6.0	2m 11s
Backend - Integration - TiDB@^6.0	2m 11s
Backend - Integration - TiDB@^5.4	15m 24s
Backend - Integration - TiDB@^5.4	4m 48s
Backend - Integration - TiDB@^5.0	15m 23s
Backend - Integration - TiDB@^5.0	8m 35s
	56m 14s

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