feat(nextjs): Use afterProductionBuild to upload sourcemaps and do release management

[lforst]

Ref vercel/next.js#77345

Next.js is adding an afterProductionBuild hook that we can use to upload sourcemaps and do release management with.

Unfortunately because we need to support older Next.js versions we still need to maintain our Webpack logic so for now I opted to run the afterProductionBuild logic only if we never ran our webpack logic. That way we should never do duplicate work.

[github-actions]

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	23.2 KB	-	-
@sentry/browser - with treeshaking flags	23.02 KB	-	-
@sentry/browser (incl. Tracing)	36.83 KB	-	-
@sentry/browser (incl. Tracing, Replay)	73.99 KB	-	-
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	67.39 KB	-	-
@sentry/browser (incl. Tracing, Replay with Canvas)	78.66 KB	-	-
@sentry/browser (incl. Tracing, Replay, Feedback)	91.22 KB	-	-
@sentry/browser (incl. Feedback)	40.33 KB	-	-
@sentry/browser (incl. sendFeedback)	27.83 KB	-	-
@sentry/browser (incl. FeedbackAsync)	32.63 KB	-	-
@sentry/react	25 KB	-	-
@sentry/react (incl. Tracing)	38.75 KB	-	-
@sentry/vue	27.41 KB	-	-
@sentry/vue (incl. Tracing)	38.55 KB	-	-
@sentry/svelte	23.23 KB	-	-
CDN Bundle	24.44 KB	-	-
CDN Bundle (incl. Tracing)	36.85 KB	-	-
CDN Bundle (incl. Tracing, Replay)	71.87 KB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback)	77.07 KB	-	-
CDN Bundle - uncompressed	71.24 KB	-	-
CDN Bundle (incl. Tracing) - uncompressed	108.94 KB	-	-
CDN Bundle (incl. Tracing, Replay) - uncompressed	220.23 KB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	232.8 KB	-	-
@sentry/nextjs (client)	40.06 KB	+0.01%	+1 B 🔺
@sentry/sveltekit (client)	37.26 KB	-	-
@sentry/node	142.88 KB	-0.01%	-1 B 🔽
@sentry/node - without tracing	96.08 KB	-	-
@sentry/aws-serverless	120.43 KB	+0.01%	+3 B 🔺

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