meta: Update 7.0.0-beta.2 CHANGELOG

[AbhiPrasad]

Opened a PR to update changelog. Feel free to push to this as appropriate as things get merged in!

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser - ES5 CDN Bundle (gzipped + minified)	19.33 KB (-4.03% 🔽)
@sentry/browser - ES5 CDN Bundle (minified)	59.9 KB (-7.29% 🔽)
@sentry/browser - ES6 CDN Bundle (gzipped + minified)	18.18 KB (-3.61% 🔽)
@sentry/browser - ES6 CDN Bundle (minified)	53.59 KB (-7.56% 🔽)
@sentry/browser - Webpack (gzipped + minified)	19.88 KB (-14.47% 🔽)
@sentry/browser - Webpack (minified)	63.04 KB (-22.86% 🔽)
@sentry/react - Webpack (gzipped + minified)	19.9 KB (-14.51% 🔽)
@sentry/nextjs Client - Webpack (gzipped + minified)	43.82 KB (-8.82% 🔽)
@sentry/browser + @sentry/tracing - ES5 CDN Bundle (gzipped + minified)	25.43 KB (-2.46% 🔽)
@sentry/browser + @sentry/tracing - ES6 CDN Bundle (gzipped + minified)	23.93 KB (-2.24% 🔽)