test(node): Replace express v5 integration tests with E2E test

[mydea]

We used to duplicate all the express integration tests and run yarn separately for them to test express v5. This is a bit unfortunate and also hard to keep in sync (already we added/changed tests in express v4 but not v5). This PR replaces the express v5 stuff with a dedicated express-v5 e2e test - we actually did not have any of that so far :O

I thought about using v5 by default and having an express-v4 e2e test app instead, but express v4 is still vastly more in use than v5, so that's probably easier.

[github-actions]

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	23.75 kB	-	-
@sentry/browser - with treeshaking flags	22.33 kB	-	-
@sentry/browser (incl. Tracing)	39.39 kB	-	-
@sentry/browser (incl. Tracing, Replay)	77.52 kB	-	-
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	67.36 kB	-	-
@sentry/browser (incl. Tracing, Replay with Canvas)	82.22 kB	-	-
@sentry/browser (incl. Tracing, Replay, Feedback)	94.34 kB	-	-
@sentry/browser (incl. Feedback)	40.44 kB	-	-
@sentry/browser (incl. sendFeedback)	28.42 kB	-	-
@sentry/browser (incl. FeedbackAsync)	33.33 kB	-	-
@sentry/react	25.49 kB	-	-
@sentry/react (incl. Tracing)	41.39 kB	-	-
@sentry/vue	28.18 kB	-	-
@sentry/vue (incl. Tracing)	41.21 kB	-	-
@sentry/svelte	23.77 kB	-	-
CDN Bundle	25.16 kB	-	-
CDN Bundle (incl. Tracing)	39.2 kB	-	-
CDN Bundle (incl. Tracing, Replay)	75.2 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback)	80.64 kB	-	-
CDN Bundle - uncompressed	73.42 kB	-	-
CDN Bundle (incl. Tracing) - uncompressed	116.08 kB	-	-
CDN Bundle (incl. Tracing, Replay) - uncompressed	230.06 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	242.88 kB	-	-
@sentry/nextjs (client)	43.41 kB	-	-
@sentry/sveltekit (client)	39.83 kB	-	-
@sentry/node-core	47.32 kB	-	-
@sentry/node	143.92 kB	+0.26%	+370 B 🔺
@sentry/node - without tracing	91.4 kB	-	-
@sentry/aws-serverless	102.85 kB	-	-

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