test(browser): port requests and web vitals to span streaming

[msonnb]

Exercise request instrumentation, web vitals, interactions, and user timing with default span streaming. Fold the streamed twins into the base suites while preserving request header, resource timing, and span parent assertions. RTT is now checked as a span attribute on both pageload and navigation.

Stacked on #24881 for the shared span collector. The scoped Chromium and WebKit run passed 127 tests, with 25 expected skips; Firefox and rebuilt CDN checks also passed after allowing zero-duration buffered streams in WebKit. Build, full unit suite, lint, typechecks, and formatting passed.

Fixes #24143

[github-actions]

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	29.52 kB	-	-
@sentry/browser - with treeshaking flags	27.68 kB	-	-
@sentry/browser - with treeshaking flags tracing without tracing	27.57 kB	-	-
@sentry/browser (incl. Tracing)	51.42 kB	-	-
@sentry/browser (incl. Tracing + Span Streaming)	51.43 kB	-	-
@sentry/browser (incl. Tracing, Profiling)	54.41 kB	-	-
@sentry/browser (incl. Tracing, Replay)	91.04 kB	-	-
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	80.04 kB	-	-
@sentry/browser (incl. Tracing, Replay with Canvas)	95.74 kB	-	-
@sentry/browser (incl. Tracing, Replay, Feedback)	108.73 kB	-	-
@sentry/browser (incl. Feedback)	47.02 kB	-	-
@sentry/browser (incl. sendFeedback)	34.58 kB	-	-
@sentry/browser (incl. FeedbackAsync)	39.68 kB	-	-
@sentry/browser (incl. Metrics)	30.53 kB	-	-
@sentry/browser (incl. Logs)	30.81 kB	-	-
@sentry/browser (incl. Metrics & Logs)	31.48 kB	-	-
@sentry/react	31.36 kB	-	-
@sentry/react (incl. Tracing)	53.77 kB	+0.01%	+1 B 🔺
@sentry/vue	37.49 kB	-	-
@sentry/vue (incl. Tracing)	54.33 kB	-	-
@sentry/svelte	29.55 kB	-	-
@sentry/remix (Remix 3 client bundle)	55.76 kB	-	-
CDN Bundle	31.23 kB	-	-
CDN Bundle (incl. Tracing)	51.98 kB	-	-
CDN Bundle (incl. Logs, Metrics)	33.46 kB	-	-
CDN Bundle (incl. Tracing, Logs, Metrics)	53.93 kB	-	-
CDN Bundle (incl. Replay, Logs, Metrics)	74.23 kB	-	-
CDN Bundle (incl. Tracing, Replay)	89.57 kB	-	-
CDN Bundle (incl. Tracing, Replay, Logs, Metrics)	91.52 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback)	95.72 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)	97.71 kB	-	-
CDN Bundle - uncompressed	92.15 kB	-	-
CDN Bundle (incl. Tracing) - uncompressed	154.48 kB	-	-
CDN Bundle (incl. Logs, Metrics) - uncompressed	98.73 kB	-	-
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed	160.44 kB	-	-
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed	228.37 kB	-	-
CDN Bundle (incl. Tracing, Replay) - uncompressed	274.29 kB	-	-
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed	280.23 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	287.99 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed	293.92 kB	-	-
@sentry/nextjs (client)	56.3 kB	-	-
@sentry/sveltekit (client)	51.83 kB	-	-
@sentry/core/server	40.58 kB	-	-
@sentry/core/browser	13.62 kB	-	-
@sentry/node	144.75 kB	+0.01%	+10 B 🔺
@sentry/node/import (ESM hook with diagnostics-channel injection)	83.22 kB	-	-
@sentry/node - without tracing	93.31 kB	+0.01%	+4 B 🔺
@sentry/node - without channel injection	122.95 kB	+0.01%	+6 B 🔺
@sentry/aws-serverless	101.58 kB	+0.01%	+7 B 🔺
@sentry/cloudflare (withSentry) - minified	208.6 kB	-	-
@sentry/cloudflare (withSentry)	516.75 kB	-	-

View base workflow run