fix(nextjs): Make all wrappers isomorphic and available in all runtimes

[lforst]

Fixes #8738
Fixes #8416

We had an issue that sometimes some exports from our SDK were not available in all of Next.js' runtimes. This caused an issue when people imported stuff from certain runtime files into other runtime files. (e.g. import something from _app in middleware, which would cause an issue because the auto-injected wrapAppGetInitialPropsWithSentry is not exported from the edge part of the SDK).

We are fixing this by exporting all of the auto-injected exports from everywhere. This is possible because theoretically all of these exports don't use any runtime-specific internals.

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser (incl. Tracing, Replay) - Webpack (gzipped)	74.96 KB (+0.14% 🔺)
@sentry/browser (incl. Tracing) - Webpack (gzipped)	31.11 KB (0%)
@sentry/browser - Webpack (gzipped)	21.81 KB (0%)
@sentry/browser (incl. Tracing, Replay) - ES6 CDN Bundle (gzipped)	69.58 KB (+0.06% 🔺)
@sentry/browser (incl. Tracing) - ES6 CDN Bundle (gzipped)	28.15 KB (+0.01% 🔺)
@sentry/browser - ES6 CDN Bundle (gzipped)	20.17 KB (0%)
@sentry/browser (incl. Tracing, Replay) - ES6 CDN Bundle (minified & uncompressed)	219.29 KB (+0.11% 🔺)
@sentry/browser (incl. Tracing) - ES6 CDN Bundle (minified & uncompressed)	84.67 KB (0%)
@sentry/browser - ES6 CDN Bundle (minified & uncompressed)	59.83 KB (0%)
@sentry/browser (incl. Tracing) - ES5 CDN Bundle (gzipped)	31.02 KB (+0.01% 🔺)
@sentry/react (incl. Tracing, Replay) - Webpack (gzipped)	65.16 KB (+0.16% 🔺)
@sentry/react - Webpack (gzipped)	21.84 KB (0%)
@sentry/nextjs Client (incl. Tracing, Replay) - Webpack (gzipped)	92.75 KB (+0.11% 🔺)
@sentry/nextjs Client - Webpack (gzipped)	50.6 KB (-0.01% 🔽)

[kamilogorek]

NIT: newline consistency, but ignore it, as CI is already green

[kamilogorek]

Shuffling things around, what can possibly go wrong