Change default behavior to stop tracing 404s unless explicitly enabled

[dingsdax]

• Default excludes 404s
• Breaking change noted in release notes + migration path documented

[linear[bot]]

JAVA-179 Change default behavior to stop tracing 404s unless explicitly enabled (copy)

[adinauer]

Assuming this is only relevant for server side (incoming) 404s, not outgoing requests resulting in 404. Edit: Both JS and Laravel have option names that suggest it's only used for incoming requests (dropSpansForIncomingRequestStatusCodes and SENTRY_TRACE_MISSING_ROUTES_ENABLED).

We should also make it work for our OpenTelemetry integration.