Add `AGENTS.md` and tell agents to use `.cursor/skills` #6925

Job	Run time
system-test (sentry-samples-spring-boot-webflux-jakarta, false, true)	5m 7s
system-test (sentry-samples-console, false, true)	1m 50s
system-test (sentry-samples-spring-boot-jakarta-opentelemetry, true, true)	7m 41s
system-test (sentry-samples-spring-boot-jakarta-opentelemetry, true, false)	7m 11s
system-test (sentry-samples-spring-boot-jakarta, false, true)	6m 30s
system-test (sentry-samples-spring-boot, false, true)	5m 51s
system-test (sentry-samples-spring-jakarta, false, true)	4m 19s
system-test (sentry-samples-spring-boot-4, false, true)	6m 16s
system-test (sentry-samples-logback, false, true)	1m 54s
system-test (sentry-samples-log4j2, false, true)	1m 50s
system-test (sentry-samples-spring-boot-opentelemetry, true, true)	7m 2s
system-test (sentry-samples-spring-boot-4-webflux, false, true)	4m 59s
system-test (sentry-samples-spring-boot-4-opentelemetry, true, true)	7m 27s
system-test (sentry-samples-spring, false, true)	4m 13s
system-test (sentry-samples-spring-boot-webflux, false, true)	4m 45s
system-test (sentry-samples-jul, false, true)	1m 58s
system-test (sentry-samples-spring-boot-4-opentelemetry, true, false)	7m 36s
system-test (sentry-samples-spring-boot-opentelemetry-noagent, false, true)	6m 37s
system-test (sentry-samples-spring-boot-opentelemetry, true, false)	7m 2s
system-test (sentry-samples-spring-7, false, true)	4m 11s
system-test (sentry-samples-spring-boot-jakarta-opentelemetry-noagent, false, true)	7m 3s
	1h 51m 22s

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