test(nextjs): Extract pages routes tests from nextjs-app-dir e2e tests

[chargome]

This PR basically splits the existing nextjs-app-dir into two test apps, with pages and app router tests respectively.

closes https://linear.app/getsentry/issue/JS-631/split-nextjs-app-dir-e2e-test-into-app-router-and-pages-router-test

[linear]

JS-631 Split nextjs-app-dir e2e test into app router and pages router test apps

[github-actions]

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	23.76 kB	-	-
@sentry/browser - with treeshaking flags	22.35 kB	-	-
@sentry/browser (incl. Tracing)	39.41 kB	-	-
@sentry/browser (incl. Tracing, Replay)	77.52 kB	-	-
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	67.39 kB	-	-
@sentry/browser (incl. Tracing, Replay with Canvas)	82.23 kB	-	-
@sentry/browser (incl. Tracing, Replay, Feedback)	94.35 kB	-	-
@sentry/browser (incl. Feedback)	40.45 kB	-	-
@sentry/browser (incl. sendFeedback)	28.44 kB	-	-
@sentry/browser (incl. FeedbackAsync)	33.34 kB	-	-
@sentry/react	25.5 kB	-	-
@sentry/react (incl. Tracing)	41.38 kB	-	-
@sentry/vue	28.2 kB	-	-
@sentry/vue (incl. Tracing)	41.21 kB	-	-
@sentry/svelte	23.79 kB	-	-
CDN Bundle	25.28 kB	-	-
CDN Bundle (incl. Tracing)	39.28 kB	-	-
CDN Bundle (incl. Tracing, Replay)	75.39 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback)	80.82 kB	-	-
CDN Bundle - uncompressed	73.86 kB	-	-
CDN Bundle (incl. Tracing) - uncompressed	116.29 kB	-	-
CDN Bundle (incl. Tracing, Replay) - uncompressed	230.53 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	243.35 kB	-	-
@sentry/nextjs (client)	43.44 kB	-	-
@sentry/sveltekit (client)	39.84 kB	-	-
@sentry/node-core	47.48 kB	+0.01%	+1 B 🔺
@sentry/node	145.02 kB	-	-
@sentry/node - without tracing	91.58 kB	-	-
@sentry/aws-serverless	103.03 kB	+0.01%	+1 B 🔺

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