fix(TaskManager): Release "not started" semaphore on waitForFinished #33307

Job	Run time
build (22.04, 5, true, OFF, ON, ON, ON, ON, OFF, OFF, OFF, OFF, ON, false)	18m 47s
build (39, 6, true, ON, OFF, ON, ON, OFF, OFF, ON, ON, ON, OFF, false)	28m 54s
Run tests (5, ALL_BUT_PROVIDERS)	31m 52s
clang-tidy	0s
Run tests (5, POSTGRES)	6m 44s
Run tests (5, HANA)	5m 24s
Run tests (6, ALL_BUT_PROVIDERS)	32m 13s
Run tests (5, ORACLE, 22.04, binary-for-oracle)	6m 49s
	2h 10m 43s

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