client/sd: unify the service discovery callbacks within a struct #23144

Job	Run time
chunks (1, Unit Test(1))	4m 18s
chunks (1, Unit Test(1))	4m 18s
chunks (1, Unit Test(1))	4m 18s
chunks (2, Unit Test(2))	2m 45s
chunks (2, Unit Test(2))	2m 45s
chunks (2, Unit Test(2))	2m 45s
chunks (3, Unit Test(3))	3m 57s
chunks (3, Unit Test(3))	3m 57s
chunks (3, Unit Test(3))	3m 57s
chunks (4, Tests(1))	4m 54s
chunks (4, Tests(1))	4m 56s
chunks (4, Tests(1))	4m 34s
chunks (5, Tests(2))	4m 47s
chunks (5, Tests(2))	4m 46s
chunks (5, Tests(2))	4m 34s
chunks (6, Tools Test)	4m 52s
chunks (6, Tools Test)	4m 45s
chunks (6, Tools Test)	4m 45s
chunks (7, Client Integration Test)	4m 8s
chunks (7, Client Integration Test)	4m 8s
chunks (7, Client Integration Test)	4m 8s
chunks (8, TSO Integration Test)	3m 52s
chunks (8, TSO Integration Test)	3m 52s
chunks (8, TSO Integration Test)	3m 52s
chunks (9, Microservice Integration(!TSO))	5m 1s
chunks (9, Microservice Integration(!TSO))	3m 41s
chunks (9, Microservice Integration(!TSO))	3m 41s
chunks (10, Microservice Integration(TSO))	4m 6s
chunks (10, Microservice Integration(TSO))	4m 6s
chunks (10, Microservice Integration(TSO))	4m 6s
report-coverage	0s
report-coverage	0s
report-coverage	11s
	2h 4m 45s

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