feat(tracing): Deprecate transaction-related options for BrowserTracing

[mydea]

These are mostly naming changes to use span instead of transaction for options.

Missing is a new handling for routingInstrumentation, which I will tackle in a separate PR.

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser (incl. Tracing, Replay, Feedback) - Webpack (gzipped)	77.85 KB (+0.09% 🔺)
@sentry/browser (incl. Tracing, Replay) - Webpack (gzipped)	69.02 KB (+0.09% 🔺)
@sentry/browser (incl. Tracing, Replay with Canvas) - Webpack (gzipped)	72.92 KB (+0.1% 🔺)
@sentry/browser (incl. Tracing, Replay) - Webpack with treeshaking flags (gzipped)	62.66 KB (+0.1% 🔺)
@sentry/browser (incl. Tracing) - Webpack (gzipped)	33.03 KB (+0.18% 🔺)
@sentry/browser (incl. Feedback) - Webpack (gzipped)	31.24 KB (0%)
@sentry/browser (incl. sendFeedback) - Webpack (gzipped)	31.25 KB (0%)
@sentry/browser - Webpack (gzipped)	22.53 KB (0%)
@sentry/browser (incl. Tracing, Replay, Feedback) - ES6 CDN Bundle (gzipped)	75.53 KB (+0.09% 🔺)
@sentry/browser (incl. Tracing, Replay) - ES6 CDN Bundle (gzipped)	67.09 KB (+0.11% 🔺)
@sentry/browser (incl. Tracing) - ES6 CDN Bundle (gzipped)	32.91 KB (+0.19% 🔺)
@sentry/browser - ES6 CDN Bundle (gzipped)	24.36 KB (0%)
@sentry/browser (incl. Tracing, Replay) - ES6 CDN Bundle (minified & uncompressed)	211.38 KB (+0.13% 🔺)
@sentry/browser (incl. Tracing) - ES6 CDN Bundle (minified & uncompressed)	99.37 KB (+0.27% 🔺)
@sentry/browser - ES6 CDN Bundle (minified & uncompressed)	72.91 KB (0%)
@sentry/browser (incl. Tracing) - ES5 CDN Bundle (gzipped)	36.03 KB (+0.24% 🔺)
@sentry/react (incl. Tracing, Replay) - Webpack (gzipped)	69.42 KB (+0.09% 🔺)
@sentry/react - Webpack (gzipped)	22.58 KB (0%)
@sentry/nextjs Client (incl. Tracing, Replay) - Webpack (gzipped)	86.05 KB (+0.09% 🔺)
@sentry/nextjs Client - Webpack (gzipped)	50.33 KB (+0.13% 🔺)
@sentry-internal/feedback - Webpack (gzipped)	17.21 KB (0%)