feat(replay): Attach an error cause to send exceptions

[billyvg]

Attach the original exception as a cause when we throw "Unable to send replay" exceptions so that we know what is causing issues with sending replays.

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser - ES5 CDN Bundle (gzipped + minified)	20.12 KB (-0.01% 🔽)
@sentry/browser - ES5 CDN Bundle (minified)	62.52 KB (0%)
@sentry/browser - ES6 CDN Bundle (gzipped + minified)	18.75 KB (-0.01% 🔽)
@sentry/browser - ES6 CDN Bundle (minified)	55.51 KB (0%)
@sentry/browser - Webpack (gzipped + minified)	20.49 KB (0%)
@sentry/browser - Webpack (minified)	66.98 KB (0%)
@sentry/react - Webpack (gzipped + minified)	20.52 KB (0%)
@sentry/nextjs Client - Webpack (gzipped + minified)	48.2 KB (0%)
@sentry/browser + @sentry/tracing - ES5 CDN Bundle (gzipped + minified)	27.21 KB (-0.01% 🔽)
@sentry/browser + @sentry/tracing - ES6 CDN Bundle (gzipped + minified)	25.46 KB (-0.01% 🔽)
@sentry/replay ES6 CDN Bundle (gzipped + minified)	42.89 KB (+0.06% 🔺)
@sentry/replay - Webpack (gzipped + minified)	36.96 KB (+0.07% 🔺)
@sentry/browser + @sentry/tracing + @sentry/replay - ES6 CDN Bundle (gzipped + minified)	60.64 KB (+0.04% 🔺)
@sentry/browser + @sentry/replay - ES6 CDN Bundle (gzipped + minified)	54.02 KB (+0.04% 🔺)