feat(core): Export spanStreamingIntegration from CDN bundles

[nicohrubec]

• Export the integration from all CDN tracing bundles and shim for non-tracing bundles.
• Remove the CDN test skips in the browser integration tests since this should work now.
• Reserve _streamed in the terser mangler so withStreamedSpan's marker survives minification in CDN bundles.
• Some additional test changes were needed to make CI happy. Mostly cases where certain browsers don't emit some attributes but we check for strict equality with toEqual.

Closes #20273

[github-actions]

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	25.88 kB	-	-
@sentry/browser - with treeshaking flags	24.35 kB	-	-
@sentry/browser (incl. Tracing)	43.81 kB	-	-
@sentry/browser (incl. Tracing + Span Streaming)	45.5 kB	-	-
@sentry/browser (incl. Tracing, Profiling)	48.73 kB	-	-
@sentry/browser (incl. Tracing, Replay)	82.98 kB	-	-
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	72.5 kB	-	-
@sentry/browser (incl. Tracing, Replay with Canvas)	87.67 kB	-	-
@sentry/browser (incl. Tracing, Replay, Feedback)	99.93 kB	-	-
@sentry/browser (incl. Feedback)	42.7 kB	-	-
@sentry/browser (incl. sendFeedback)	30.55 kB	-	-
@sentry/browser (incl. FeedbackAsync)	35.55 kB	-	-
@sentry/browser (incl. Metrics)	27.16 kB	-	-
@sentry/browser (incl. Logs)	27.29 kB	-	-
@sentry/browser (incl. Metrics & Logs)	27.98 kB	-	-
@sentry/react	27.62 kB	-	-
@sentry/react (incl. Tracing)	46.05 kB	-	-
@sentry/vue	30.71 kB	-	-
@sentry/vue (incl. Tracing)	45.62 kB	-	-
@sentry/svelte	25.89 kB	-	-
CDN Bundle	28.58 kB	+0.11%	+29 B 🔺
CDN Bundle (incl. Tracing)	46.08 kB	+2.54%	+1.14 kB 🔺
CDN Bundle (incl. Logs, Metrics)	29.96 kB	+0.12%	+35 B 🔺
CDN Bundle (incl. Tracing, Logs, Metrics)	47.12 kB	+2.37%	+1.09 kB 🔺
CDN Bundle (incl. Replay, Logs, Metrics)	68.93 kB	+0.06%	+35 B 🔺
CDN Bundle (incl. Tracing, Replay)	83.14 kB	+1.44%	+1.18 kB 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics)	84.17 kB	+1.38%	+1.14 kB 🔺
CDN Bundle (incl. Tracing, Replay, Feedback)	88.61 kB	+1.31%	+1.14 kB 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)	89.69 kB	+1.3%	+1.15 kB 🔺
CDN Bundle - uncompressed	83.59 kB	+0.24%	+193 B 🔺
CDN Bundle (incl. Tracing) - uncompressed	137.62 kB	+2.47%	+3.31 kB 🔺
CDN Bundle (incl. Logs, Metrics) - uncompressed	87.74 kB	+0.23%	+193 B 🔺
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed	141.03 kB	+2.41%	+3.31 kB 🔺
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed	211.31 kB	+0.1%	+193 B 🔺
CDN Bundle (incl. Tracing, Replay) - uncompressed	255.06 kB	+1.32%	+3.31 kB 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed	258.46 kB	+1.3%	+3.31 kB 🔺
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	267.97 kB	+1.26%	+3.31 kB 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed	271.36 kB	+1.24%	+3.31 kB 🔺
@sentry/nextjs (client)	48.58 kB	-	-
@sentry/sveltekit (client)	44.22 kB	-	-
@sentry/node-core	58.02 kB	+0.02%	+6 B 🔺
@sentry/node	174.89 kB	+0.01%	+6 B 🔺
@sentry/node - without tracing	97.98 kB	+0.02%	+12 B 🔺
@sentry/aws-serverless	115.21 kB	+0.02%	+16 B 🔺

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