grpc_service: add `ManuallyChangePeer` and `ManuallyChangeMultiPeers`. #20391

Job	Run time
chunks (1, Unit Test(1))	2m 22s
chunks (2, Unit Test(2))	2m 24s
chunks (3, Tools Test)	2m 22s
chunks (4, Client Integration Test)	2m 10s
chunks (5, TSO Integration Test)	2m 14s
chunks (6, MicroService Integration Test)	2m 4s
report-coverage	0s
	13m 36s

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