checker: use CheckerSchedulerType for checker (#8385) #20907

Job	Run time
chunks (1, Unit Test(1))	5m 1s
chunks (2, Unit Test(2))	3m 47s
chunks (3, Unit Test(3))	4m 39s
chunks (4, Tests(1))	5m 5s
chunks (5, Tests(2))	5m 0s
chunks (6, Tools Test)	5m 53s
chunks (7, Client Integration Test)	4m 42s
chunks (8, TSO Integration Test)	4m 42s
chunks (9, MicroService Integration(!TSO))	4m 10s
chunks (10, MicroService Integration(TSO))	5m 44s
report-coverage	14s
	48m 57s

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