client/resource_group: cache request source RU metrics #28532

Job	Run time
chunks (5, Tests(2))	10m 28s
chunks (1, Unit Test(1))	8m 51s
chunks (2, Unit Test(2))	7m 11s
chunks (10, Microservice Integration(TSO))	8m 8s
chunks (3, Unit Test(3))	8m 44s
chunks (6, Tools Test)	9m 48s
chunks (4, Tests(1))	9m 31s
chunks (9, Microservice Integration(!TSO))	9m 14s
chunks (8, TSO Integration Test)	7m 49s
chunks (7, Client Integration Test)	7m 56s
report-coverage	6s
	1h 27m 46s

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