client: fix backoffer initialization #23120

Job	Run time
chunks (1, Unit Test(1))	4m 23s
chunks (1, Unit Test(1))	4m 23s
chunks (2, Unit Test(2))	2m 54s
chunks (2, Unit Test(2))	2m 54s
chunks (3, Unit Test(3))	3m 52s
chunks (3, Unit Test(3))	3m 52s
chunks (4, Tests(1))	4m 45s
chunks (4, Tests(1))	4m 45s
chunks (5, Tests(2))	4m 56s
chunks (5, Tests(2))	4m 38s
chunks (6, Tools Test)	4m 56s
chunks (6, Tools Test)	4m 56s
chunks (7, Client Integration Test)	3m 56s
chunks (7, Client Integration Test)	3m 56s
chunks (8, TSO Integration Test)	4m 6s
chunks (8, TSO Integration Test)	4m 6s
chunks (9, Microservice Integration(!TSO))	3m 26s
chunks (9, Microservice Integration(!TSO))	3m 26s
chunks (10, Microservice Integration(TSO))	4m 25s
chunks (10, Microservice Integration(TSO))	4m 25s
report-coverage	0s
report-coverage	14s
	1h 23m 14s

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