fix: stop thread pools when an error occurs during startup (#3107) #6093

Job	Run time
sample_operators_tests (sample-operators/webpage)	3m 30s
sample_operators_tests (sample-operators/tomcat-operator)	3m 16s
sample_operators_tests (sample-operators/leader-election)	3m 33s
sample_operators_tests (sample-operators/mysql-schema)	3m 4s
	13m 23s

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