Detect async servlet mode and noop

[adinauer]

Problem Statement

The SDK is leaking memory (through scopes) if servlets are used in async mode.

Solution Brainstorm

Detect that servlets are used in async mode and noop in SentryServletRequestListener. Possibly suggest using our OTel integration: https://docs.sentry.io/platforms/java/guides/servlet/opentelemetry/

[linear[bot]]

JAVA-207

[adinauer]

Problems were reported in https://github.com/getsentry/sentry-java/issues/4798 and https://github.com/getsentry/sentry-java/issues/3568