feat(browser): Detect redirects when emitting navigation spans

[mydea]

Closes #15286

This PR adds a new option to browserTracingIntegration, detectRedirects, which is enabled by default. If this is enabled, the integration will try to detect if a navigation is actually a redirect based on a simple heuristic, and in this case, will not end the ongoing pageload/navigation, but instead let it run and create a navigation.redirect zero-duration span instead.

An example trace for this would be: https://sentry-sdks.sentry.io/explore/discover/trace/95280de69dc844448d39de7458eab527/?dataset=transactions&eventId=8a1150fd1dc846e4ac8420ccf03ad0ee&field=title&field=project&field=user.display&field=timestamp&name=All%20Errors&project=4504956726345728&query=&queryDataset=transaction-like&sort=-timestamp&source=discover&statsPeriod=5m&timestamp=1747646096&yAxis=count%28%29

Where the respective index route that triggered this has this code:

setTimeout(() => {
  window.history.pushState({}, "", "/test-sub-page");
  fetch('https://example.com')
}, 100);

The used heuristic is:

• If the ongoing pageload/navigation was started less than 300ms ago...
• ... and no click has happened in this time...
• ... then we consider the navigation a redirect

this limit was chosen somewhat arbitrarily, open for other suggestions too.

While this logic will not be 100% bullet proof, it should be reliable enough and likely better than what we have today. Users can opt-out of this logic via browserTracingIntegration({ detectRedirects: false }), if needed.

[github-actions]

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	24.04 kB	+0.01%	+1 B 🔺
@sentry/browser - with treeshaking flags	23.7 kB	+0.01%	+1 B 🔺
@sentry/browser (incl. Tracing)	38.66 kB	+0.53%	+200 B 🔺
@sentry/browser (incl. Tracing, Replay)	76.78 kB	+0.25%	+191 B 🔺
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	69.78 kB	+0.25%	+170 B 🔺
@sentry/browser (incl. Tracing, Replay with Canvas)	81.56 kB	+0.26%	+204 B 🔺
@sentry/browser (incl. Tracing, Replay, Feedback)	93.67 kB	+0.22%	+204 B 🔺
@sentry/browser (incl. Feedback)	40.83 kB	-	-
@sentry/browser (incl. sendFeedback)	28.79 kB	-	-
@sentry/browser (incl. FeedbackAsync)	33.66 kB	-0.01%	-1 B 🔽
@sentry/react	25.86 kB	-	-
⛔️ @sentry/react (incl. Tracing) (max: 40.5 kB)	40.69 kB	+0.52%	+208 B 🔺
@sentry/vue	28.44 kB	-0.01%	-1 B 🔽
@sentry/vue (incl. Tracing)	40.49 kB	+0.51%	+202 B 🔺
@sentry/svelte	24.07 kB	-0.01%	-1 B 🔽
CDN Bundle	25.25 kB	-0.01%	-1 B 🔽
CDN Bundle (incl. Tracing)	38.72 kB	+0.47%	+180 B 🔺
CDN Bundle (incl. Tracing, Replay)	74.52 kB	+0.27%	+200 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback)	79.97 kB	+0.26%	+200 B 🔺
CDN Bundle - uncompressed	73.68 kB	-	-
CDN Bundle (incl. Tracing) - uncompressed	114.5 kB	+0.38%	+427 B 🔺
CDN Bundle (incl. Tracing, Replay) - uncompressed	228.47 kB	+0.19%	+427 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	241.3 kB	+0.18%	+427 B 🔺
@sentry/nextjs (client)	42.3 kB	+0.51%	+213 B 🔺
⛔️ @sentry/sveltekit (client) (max: 39 kB)	39.16 kB	+0.54%	+210 B 🔺
@sentry/node	158.16 kB	+0.01%	+1 B 🔺
@sentry/node - without tracing	98.07 kB	-	-
@sentry/aws-serverless	123.41 kB	-0.01%	-1 B 🔽

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