feat(browser): Add ingest_settings to span v2 envelope payload

[nicohrubec]

Adds version: 2 and ingest_settings to the span streaming envelope payload so Relay can infer the end-user IP address and User-Agent from the incoming request (link to spec). This is only emitted by the browser SDK.

Both settings are currently gated behind sendDefaultPii (modeled after how event.sdk.settings.infer_ip works today).

Manually tested E2E with a local react app and looks fine.

Closes #20275

[github-actions]

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	26.16 kB	-	-
@sentry/browser - with treeshaking flags	24.63 kB	-	-
@sentry/browser (incl. Tracing)	44.11 kB	-	-
@sentry/browser (incl. Tracing + Span Streaming)	46.16 kB	+0.11%	+49 B 🔺
@sentry/browser (incl. Tracing, Profiling)	49.06 kB	-	-
@sentry/browser (incl. Tracing, Replay)	83.36 kB	-	-
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	72.84 kB	-	-
@sentry/browser (incl. Tracing, Replay with Canvas)	88.03 kB	-	-
@sentry/browser (incl. Tracing, Replay, Feedback)	100.69 kB	-	-
@sentry/browser (incl. Feedback)	43.4 kB	-	-
@sentry/browser (incl. sendFeedback)	30.96 kB	-	-
@sentry/browser (incl. FeedbackAsync)	36.14 kB	-	-
@sentry/browser (incl. Metrics)	27.44 kB	-	-
@sentry/browser (incl. Logs)	27.59 kB	-	-
@sentry/browser (incl. Metrics & Logs)	28.28 kB	-	-
@sentry/react	27.9 kB	-	-
@sentry/react (incl. Tracing)	46.35 kB	-	-
@sentry/vue	31.03 kB	-	-
@sentry/vue (incl. Tracing)	45.95 kB	-	-
@sentry/svelte	26.18 kB	-	-
CDN Bundle	28.84 kB	-	-
CDN Bundle (incl. Tracing)	46.71 kB	+0.13%	+60 B 🔺
CDN Bundle (incl. Logs, Metrics)	30.25 kB	-	-
CDN Bundle (incl. Tracing, Logs, Metrics)	47.8 kB	+0.14%	+65 B 🔺
CDN Bundle (incl. Replay, Logs, Metrics)	69.25 kB	-	-
CDN Bundle (incl. Tracing, Replay)	83.79 kB	+0.06%	+42 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics)	84.86 kB	+0.05%	+40 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback)	89.61 kB	+0.05%	+37 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)	90.7 kB	+0.06%	+49 B 🔺
CDN Bundle - uncompressed	84.55 kB	-	-
CDN Bundle (incl. Tracing) - uncompressed	139.68 kB	+0.1%	+127 B 🔺
CDN Bundle (incl. Logs, Metrics) - uncompressed	88.75 kB	-	-
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed	143.14 kB	+0.09%	+127 B 🔺
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed	212.39 kB	-	-
CDN Bundle (incl. Tracing, Replay) - uncompressed	257.17 kB	+0.04%	+98 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed	260.61 kB	+0.04%	+98 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	270.86 kB	+0.04%	+98 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed	274.3 kB	+0.04%	+98 B 🔺
@sentry/nextjs (client)	48.84 kB	-	-
@sentry/sveltekit (client)	44.56 kB	-	-
@sentry/node-core	59 kB	+0.28%	+162 B 🔺
@sentry/node	170.11 kB	+0.09%	+145 B 🔺
@sentry/node - without tracing	97.81 kB	+0.18%	+170 B 🔺
@sentry/aws-serverless	114.53 kB	+0.16%	+173 B 🔺
@sentry/cloudflare (withSentry) - minified	164.13 kB	+0.3%	+485 B 🔺
@sentry/cloudflare (withSentry)	415.2 kB	+0.25%	+1.03 kB 🔺

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[nicohrubec]

@chargome updated the detection to use isBrowser from core. what do you think about the PII gating?

[chargome]

We'll wait on getsentry/relay#5869 to be implemented before sending this.

[nicohrubec]

@chargome I'll do a full e2e test on Monday with a sample app, but should be good for another review now that this is implemented for spans in relay.