Add CLAUDE.md for Claude Code guidance (#4706) #5173

Job	Run time
system-test (sentry-samples-spring-boot, false, true)	3m 15s
system-test (sentry-samples-spring-boot-opentelemetry-noagent, false, true)	5m 35s
system-test (sentry-samples-spring-boot-webflux-jakarta, false, true)	3m 8s
system-test (sentry-samples-spring-boot-jakarta, false, true)	2m 55s
system-test (sentry-samples-logback, false, true)	1m 56s
system-test (sentry-samples-spring-boot-4-webflux, false, true)	3m 8s
system-test (sentry-samples-jul, false, true)	2m 1s
system-test (sentry-samples-console, false, true)	1m 31s
system-test (sentry-samples-spring-boot-opentelemetry, true, false)	5m 18s
system-test (sentry-samples-spring-boot-jakarta-opentelemetry-noagent, false, true)	5m 49s
system-test (sentry-samples-spring-jakarta, false, true)	2m 20s
system-test (sentry-samples-spring-boot-4-opentelemetry, true, true)	6m 4s
system-test (sentry-samples-spring-boot-4, false, true)	2m 43s
system-test (sentry-samples-log4j2, false, true)	2m 2s
system-test (sentry-samples-spring-boot-jakarta-opentelemetry, true, true)	5m 52s
system-test (sentry-samples-spring-boot-jakarta-opentelemetry, true, false)	5m 30s
system-test (sentry-samples-spring-boot-4-opentelemetry, true, false)	5m 43s
system-test (sentry-samples-spring-boot-webflux, false, true)	2m 59s
system-test (sentry-samples-spring-boot-opentelemetry, true, true)	5m 49s
	1h 13m 38s

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