grpc_service: add `ManuallyChangePeer` and `ManuallyChangeMultiPeers`. #20426

Job	Run time
chunks (1, Unit Test(1))	2m 22s
chunks (2, Unit Test(2))	2m 21s
chunks (3, Tools Test)	2m 20s
chunks (4, Client Integration Test)	2m 5s
chunks (5, TSO Integration Test)	2m 4s
chunks (6, MicroService Integration Test)	2m 14s
report-coverage	0s
	13m 26s

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