feat(node-experimental): Move errorHandler

[mydea]

Also stop exporting requestHandler, as that should be handled bu the otel http instrumentation.

I also fixed the otel stuff to properly take care of sessions.

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser (incl. Tracing, Replay, Feedback) - Webpack (gzipped)	77.84 KB (0%)
@sentry/browser (incl. Tracing, Replay) - Webpack (gzipped)	69.1 KB (0%)
@sentry/browser (incl. Tracing, Replay with Canvas) - Webpack (gzipped)	73.02 KB (0%)
@sentry/browser (incl. Tracing, Replay) - Webpack with treeshaking flags (gzipped)	62.67 KB (0%)
@sentry/browser (incl. Tracing) - Webpack (gzipped)	33.28 KB (0%)
@sentry/browser (incl. browserTracingIntegration) - Webpack (gzipped)	33.2 KB (0%)
@sentry/browser (incl. Feedback) - Webpack (gzipped)	31.18 KB (0%)
@sentry/browser (incl. sendFeedback) - Webpack (gzipped)	31.18 KB (0%)
@sentry/browser - Webpack (gzipped)	22.43 KB (0%)
@sentry/browser (incl. Tracing, Replay, Feedback) - ES6 CDN Bundle (gzipped)	76.2 KB (0%)
@sentry/browser (incl. Tracing, Replay) - ES6 CDN Bundle (gzipped)	67.7 KB (0%)
@sentry/browser (incl. Tracing) - ES6 CDN Bundle (gzipped)	33.62 KB (0%)
@sentry/browser - ES6 CDN Bundle (gzipped)	24.76 KB (0%)
@sentry/browser (incl. Tracing, Replay) - ES6 CDN Bundle (minified & uncompressed)	213.11 KB (0%)
@sentry/browser (incl. Tracing) - ES6 CDN Bundle (minified & uncompressed)	101.74 KB (0%)
@sentry/browser - ES6 CDN Bundle (minified & uncompressed)	74.23 KB (0%)
@sentry/browser (incl. Tracing) - ES5 CDN Bundle (gzipped)	36.9 KB (0%)
@sentry/react (incl. Tracing, Replay) - Webpack (gzipped)	69.43 KB (0%)
@sentry/react - Webpack (gzipped)	22.46 KB (0%)
@sentry/nextjs Client (incl. Tracing, Replay) - Webpack (gzipped)	86.89 KB (0%)
@sentry/nextjs Client - Webpack (gzipped)	50.1 KB (0%)
@sentry-internal/feedback - Webpack (gzipped)	17.15 KB (0%)