fix: stop thread pools when an error occurs during startup #6084

Job	Run time
sample_operators_tests (sample-operators/webpage)	3m 15s
sample_operators_tests (sample-operators/tomcat-operator)	3m 17s
sample_operators_tests (sample-operators/mysql-schema)	2m 44s
sample_operators_tests (sample-operators/leader-election)	3m 23s
	12m 39s

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