feat: Ensure withActiveSpan is exported everywhere [v7]

[mydea]

We forgot to re-export this everywhere, oops.

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser (incl. Tracing, Replay, Feedback) - Webpack (gzipped)	78.71 KB (+0.07% 🔺)
@sentry/browser (incl. Tracing, Replay) - Webpack (gzipped)	69.87 KB (-0.01% 🔽)
@sentry/browser (incl. Tracing, Replay with Canvas) - Webpack (gzipped)	73.83 KB (+0.03% 🔺)
@sentry/browser (incl. Tracing, Replay) - Webpack with treeshaking flags (gzipped)	63.48 KB (-0.01% 🔽)
@sentry/browser (incl. Tracing) - Webpack (gzipped)	33.84 KB (0%)
@sentry/browser (incl. browserTracingIntegration) - Webpack (gzipped)	34.88 KB (0%)
@sentry/browser (incl. Feedback) - Webpack (gzipped)	31.44 KB (+0.14% 🔺)
@sentry/browser (incl. sendFeedback) - Webpack (gzipped)	31.45 KB (+0.14% 🔺)
@sentry/browser - Webpack (gzipped)	22.68 KB (0%)
@sentry/browser (incl. Tracing, Replay, Feedback) - ES6 CDN Bundle (gzipped)	76.98 KB (+0.09% 🔺)
@sentry/browser (incl. Tracing, Replay) - ES6 CDN Bundle (gzipped)	68.4 KB (+0.03% 🔺)
@sentry/browser (incl. Tracing) - ES6 CDN Bundle (gzipped)	34.2 KB (+0.05% 🔺)
@sentry/browser - ES6 CDN Bundle (gzipped)	25.11 KB (+0.08% 🔺)
@sentry/browser (incl. Tracing, Replay) - ES6 CDN Bundle (minified & uncompressed)	215.54 KB (+0.03% 🔺)
@sentry/browser (incl. Tracing) - ES6 CDN Bundle (minified & uncompressed)	103.35 KB (+0.07% 🔺)
@sentry/browser - ES6 CDN Bundle (minified & uncompressed)	75.38 KB (+0.09% 🔺)
@sentry/browser (incl. Tracing) - ES5 CDN Bundle (gzipped)	37.37 KB (+0.06% 🔺)
@sentry/react (incl. Tracing, Replay) - Webpack (gzipped)	70.25 KB (-0.01% 🔽)
@sentry/react - Webpack (gzipped)	22.71 KB (0%)
@sentry/nextjs Client (incl. Tracing, Replay) - Webpack (gzipped)	89.1 KB (-0.01% 🔽)
@sentry/nextjs Client - Webpack (gzipped)	53.28 KB (0%)
@sentry-internal/feedback - Webpack (gzipped)	17.28 KB (+0.25% 🔺)