feat(nextjs): Prepare for next 16 bundler default

[chargome]

Next.js will switch the default bundler starting with Next.js v16

• Updated detection logic for turbopack vs webpack
• Updated generic tests (app dir + pages dir) to only run on webpack (we'll need to update these as soon as next16 is released) (there are tests that won't pass on turbopack and keeping this in sync for both bundlers will become unmaintainable)
• Add a bunch of unit tests

[github-actions]

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	24.26 kB	-	-
@sentry/browser - with treeshaking flags	22.77 kB	-	-
@sentry/browser (incl. Tracing)	40.45 kB	-	-
@sentry/browser (incl. Tracing, Replay)	78.83 kB	-	-
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	68.47 kB	-	-
@sentry/browser (incl. Tracing, Replay with Canvas)	83.5 kB	-0.01%	-1 B 🔽
@sentry/browser (incl. Tracing, Replay, Feedback)	95.69 kB	-	-
@sentry/browser (incl. Feedback)	40.97 kB	-	-
@sentry/browser (incl. sendFeedback)	28.91 kB	-	-
@sentry/browser (incl. FeedbackAsync)	33.84 kB	-0.01%	-1 B 🔽
@sentry/react	25.98 kB	-	-
@sentry/react (incl. Tracing)	42.42 kB	-0.01%	-1 B 🔽
@sentry/vue	28.77 kB	-	-
@sentry/vue (incl. Tracing)	42.26 kB	-	-
@sentry/svelte	24.29 kB	-	-
CDN Bundle	25.77 kB	-	-
CDN Bundle (incl. Tracing)	40.33 kB	-	-
CDN Bundle (incl. Tracing, Replay)	76.58 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback)	82.08 kB	-	-
CDN Bundle - uncompressed	75.35 kB	-	-
CDN Bundle (incl. Tracing) - uncompressed	119.36 kB	-	-
CDN Bundle (incl. Tracing, Replay) - uncompressed	234.52 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	247.28 kB	-	-
@sentry/nextjs (client)	44.42 kB	+0.01%	+1 B 🔺
@sentry/sveltekit (client)	40.87 kB	-	-
@sentry/node-core	50.56 kB	-	-
@sentry/node	154.19 kB	+0.01%	+1 B 🔺
@sentry/node - without tracing	92.42 kB	+0.01%	+1 B 🔺
@sentry/aws-serverless	106.14 kB	-	-

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