feat(core): Deprecate new Transaction()

[mydea]

No more transaction class!

This should not really affect users, as they should only use startTransaction() anyhow.

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser (incl. Tracing, Replay, Feedback) - Webpack (gzipped)	76.88 KB (+0.06% 🔺)
@sentry/browser (incl. Tracing, Replay) - Webpack (gzipped)	68.25 KB (+0.06% 🔺)
@sentry/browser (incl. Tracing, Replay) - Webpack with treeshaking flags (gzipped)	61.88 KB (+0.07% 🔺)
@sentry/browser (incl. Tracing) - Webpack (gzipped)	32.29 KB (+0.16% 🔺)
@sentry/browser (incl. Feedback) - Webpack (gzipped)	30.74 KB (+0.04% 🔺)
@sentry/browser - Webpack (gzipped)	22.1 KB (+0.04% 🔺)
@sentry/browser (incl. Tracing, Replay, Feedback) - ES6 CDN Bundle (gzipped)	74.57 KB (+0.05% 🔺)
@sentry/browser (incl. Tracing, Replay) - ES6 CDN Bundle (gzipped)	66.2 KB (+0.06% 🔺)
@sentry/browser (incl. Tracing) - ES6 CDN Bundle (gzipped)	32.03 KB (+0.12% 🔺)
@sentry/browser - ES6 CDN Bundle (gzipped)	23.74 KB (+0.03% 🔺)
@sentry/browser (incl. Tracing, Replay) - ES6 CDN Bundle (minified & uncompressed)	208.68 KB (+0.03% 🔺)
@sentry/browser (incl. Tracing) - ES6 CDN Bundle (minified & uncompressed)	96.74 KB (+0.07% 🔺)
@sentry/browser - ES6 CDN Bundle (minified & uncompressed)	70.95 KB (+0.03% 🔺)
@sentry/browser (incl. Tracing) - ES5 CDN Bundle (gzipped)	35 KB (+0.1% 🔺)
@sentry/react (incl. Tracing, Replay) - Webpack (gzipped)	68.63 KB (+0.07% 🔺)
@sentry/react - Webpack (gzipped)	22.13 KB (+0.04% 🔺)
@sentry/nextjs Client (incl. Tracing, Replay) - Webpack (gzipped)	85.36 KB (+0.05% 🔺)
@sentry/nextjs Client - Webpack (gzipped)	49.48 KB (+0.09% 🔺)
@sentry-internal/feedback - Webpack (gzipped)	16.75 KB (+0.06% 🔺)

[Lms24]

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