ref: Remove BrowserTracing

[lforst]

Removes all references to BrowserTracing from the code base.

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser (incl. Tracing, Replay, Feedback) - Webpack (gzipped)	77.4 KB (-0.15% 🔽)
@sentry/browser (incl. Tracing, Replay) - Webpack (gzipped)	68.67 KB (-0.18% 🔽)
@sentry/browser (incl. Tracing, Replay with Canvas) - Webpack (gzipped)	72.56 KB (-0.2% 🔽)
@sentry/browser (incl. Tracing, Replay) - Webpack with treeshaking flags (gzipped)	62.18 KB (-0.19% 🔽)
@sentry/browser (incl. Tracing) - Webpack (gzipped)	32.89 KB (-0.34% 🔽)
@sentry/browser (incl. browserTracingIntegration) - Webpack (gzipped)	32.89 KB (-0.02% 🔽)
@sentry/browser (incl. Feedback) - Webpack (gzipped)	30.91 KB (0%)
@sentry/browser (incl. sendFeedback) - Webpack (gzipped)	30.91 KB (0%)
@sentry/browser - Webpack (gzipped)	22.19 KB (0%)
@sentry/browser (incl. Tracing, Replay, Feedback) - ES6 CDN Bundle (gzipped)	75.81 KB (-0.26% 🔽)
@sentry/browser (incl. Tracing, Replay) - ES6 CDN Bundle (gzipped)	67.55 KB (+0.03% 🔺)
@sentry/browser (incl. Tracing) - ES6 CDN Bundle (gzipped)	33.35 KB (-0.32% 🔽)
@sentry/browser - ES6 CDN Bundle (gzipped)	24.72 KB (+0.02% 🔺)
@sentry/browser (incl. Tracing, Replay) - ES6 CDN Bundle (minified & uncompressed)	211.46 KB (-0.33% 🔽)
@sentry/browser (incl. Tracing) - ES6 CDN Bundle (minified & uncompressed)	100.17 KB (-0.68% 🔽)
@sentry/browser - ES6 CDN Bundle (minified & uncompressed)	73.78 KB (-0.22% 🔽)
@sentry/browser (incl. Tracing) - ES5 CDN Bundle (gzipped)	36.42 KB (-0.9% 🔽)
@sentry/react (incl. Tracing, Replay) - Webpack (gzipped)	68.96 KB (-0.19% 🔽)
@sentry/react - Webpack (gzipped)	22.22 KB (0%)
@sentry/nextjs Client (incl. Tracing, Replay) - Webpack (gzipped)	85.39 KB (-1.36% 🔽)
@sentry/nextjs Client - Webpack (gzipped)	49.8 KB (-0.01% 🔽)
@sentry-internal/feedback - Webpack (gzipped)	17.14 KB (0%)

[lforst]

finally