fix: stop thread pools when an error occurs during startup #6088

Job	Run time
sample_operators_tests (sample-operators/webpage)	1m 57s
sample_operators_tests (sample-operators/leader-election)	1m 43s
sample_operators_tests (sample-operators/tomcat-operator)	1m 47s
sample_operators_tests (sample-operators/mysql-schema)	1m 59s
sample_operators_tests (sample-operators/leader-election)	2m 37s
sample_operators_tests (sample-operators/mysql-schema)	2m 38s
sample_operators_tests (sample-operators/webpage)	2m 23s
sample_operators_tests (sample-operators/tomcat-operator)	2m 38s
sample_operators_tests (sample-operators/tomcat-operator)	7m 1s
sample_operators_tests (sample-operators/leader-election)	3m 16s
sample_operators_tests (sample-operators/webpage)	3m 7s
sample_operators_tests (sample-operators/mysql-schema)	2m 53s
sample_operators_tests (sample-operators/mysql-schema)	2m 53s
sample_operators_tests (sample-operators/tomcat-operator)	3m 11s
sample_operators_tests (sample-operators/leader-election)	3m 16s
sample_operators_tests (sample-operators/webpage)	3m 7s
	46m 26s

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