server, config: support updating leader lease online #28726

Job	Run time
chunks (1, Unit Test(1))	4m 26s
chunks (9, Microservice Integration(!TSO))	4m 32s
chunks (4, Tests(1))	4m 32s
chunks (2, Unit Test(2))	4m 26s
chunks (10, Microservice Integration(TSO))	4m 25s
chunks (5, Tests(2))	4m 26s
chunks (3, Unit Test(3))	4m 26s
chunks (6, Tools Test)	4m 33s
chunks (8, TSO Integration Test)	4m 33s
chunks (7, Client Integration Test)	4m 32s
report-coverage	5s
	44m 56s

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