feat(types): beforeSend and beforeSendTransaction breaking changes

[timfish]

These were marked to be changed for v8

[codecov]

Bundle Report

Bundle size has no change ✅

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser (incl. Tracing, Replay, Feedback)	76.08 KB (-0.09% 🔽)
@sentry/browser (incl. Tracing, Replay)	67.35 KB (-0.12% 🔽)
@sentry/browser (incl. Tracing, Replay with Canvas)	71.18 KB (-0.12% 🔽)
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	60.91 KB (-0.13% 🔽)
@sentry/browser (incl. Tracing)	32 KB (-0.27% 🔽)
@sentry/browser (incl. browserTracingIntegration)	32 KB (-0.27% 🔽)
@sentry/browser (incl. feedbackIntegration)	31.28 KB (+0.02% 🔺)
@sentry/browser (incl. feedbackModalIntegration)	31.39 KB (+0.01% 🔺)
@sentry/browser (incl. feedbackScreenshotIntegration)	31.39 KB (+0.01% 🔺)
@sentry/browser (incl. sendFeedback)	27.35 KB (-0.03% 🔽)
@sentry/browser	22.52 KB (+0.03% 🔺)
CDN Bundle (incl. Tracing, Replay, Feedback)	71.11 KB (-0.08% 🔽)
CDN Bundle (incl. Tracing, Replay)	65.82 KB (-0.14% 🔽)
CDN Bundle (incl. Tracing)	32.14 KB (-0.28% 🔽)
CDN Bundle	23.74 KB (-0.01% 🔽)
CDN Bundle (incl. Tracing, Replay) - uncompressed	205.1 KB (-0.18% 🔽)
CDN Bundle (incl. Tracing) - uncompressed	95.75 KB (-0.38% 🔽)
CDN Bundle - uncompressed	70.05 KB (-0.03% 🔽)
@sentry/react (incl. Tracing, Replay)	67.32 KB (-0.15% 🔽)
@sentry/react	22.55 KB (+0.05% 🔺)