Avoid ExecutorService for DefaultCompositePerformanceCollector timeout #5772

Job	Run time
system-test (sentry-samples-spring-boot, false, true)	3m 5s
system-test (sentry-samples-spring-boot-opentelemetry, true, false)	5m 25s
system-test (sentry-samples-spring-boot-jakarta-opentelemetry, true, true)	5m 32s
system-test (sentry-samples-spring-boot-opentelemetry, true, true)	5m 15s
system-test (sentry-samples-spring-boot-opentelemetry-noagent, false, true)	5m 14s
system-test (sentry-samples-console, false, true)	1m 57s
system-test (sentry-samples-spring-boot-jakarta-opentelemetry, true, false)	5m 47s
system-test (sentry-samples-spring-boot-webflux, false, true)	3m 13s
system-test (sentry-samples-spring-boot-jakarta, false, true)	4m 58s
system-test (sentry-samples-spring-boot-webflux-jakarta, false, true)	2m 35s
system-test (sentry-samples-spring-boot-4, false, true)	3m 11s
system-test (sentry-samples-log4j2, false, true)	1m 50s
system-test (sentry-samples-spring, false, true)	2m 19s
system-test (sentry-samples-spring-boot-4-opentelemetry, true, true)	5m 34s
system-test (sentry-samples-spring-boot-jakarta-opentelemetry-noagent, false, true)	5m 33s
system-test (sentry-samples-jul, false, true)	1m 41s
system-test (sentry-samples-spring-boot-4-webflux, false, true)	2m 49s
system-test (sentry-samples-spring-jakarta, false, true)	2m 26s
system-test (sentry-samples-logback, false, true)	1m 58s
system-test (sentry-samples-spring-boot-4-opentelemetry, true, false)	5m 36s
system-test (sentry-samples-spring-7, false, true)	2m 32s
	1h 18m 30s

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