fix(browser): Propagate trace data from active span if http.client span is non-recording

[Lms24]

This PR fixes an inconsistency with trace propagation via browser http.client spans: If an http.client span was started as a NonRecordingSpan we'd still take it as the span we generate our tracing headers from (via getTraceData). What we should do instead is to propagate the currently active span, so that span trees from a downstream service don't become orphaned.

This PR also adds integration tests for 3 scenarios with ignoreSpans:

• ignoring a segment span should force a negative sampling decision on propagation, even if the incoming trace is sampled positively
• ignoring a child span should continue the segment span's sampling decision on propagation
• akin: ignoring an http.client span should still continue the positive sampling decision on propagation

ref: #22262

[github-actions]

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	27.65 kB	-	-
@sentry/browser - with treeshaking flags	26.1 kB	-	-
@sentry/browser (incl. Tracing)	46.48 kB	+0.13%	+57 B 🔺
@sentry/browser (incl. Tracing + Span Streaming)	48.27 kB	+0.12%	+57 B 🔺
@sentry/browser (incl. Tracing, Profiling)	51.25 kB	+0.11%	+55 B 🔺
@sentry/browser (incl. Tracing, Replay)	85.71 kB	+0.05%	+42 B 🔺
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	75.35 kB	+0.06%	+40 B 🔺
@sentry/browser (incl. Tracing, Replay with Canvas)	90.43 kB	+0.05%	+44 B 🔺
@sentry/browser (incl. Tracing, Replay, Feedback)	103.08 kB	+0.05%	+42 B 🔺
@sentry/browser (incl. Feedback)	44.83 kB	-	-
@sentry/browser (incl. sendFeedback)	32.45 kB	-	-
@sentry/browser (incl. FeedbackAsync)	37.58 kB	-	-
@sentry/browser (incl. Metrics)	28.74 kB	-	-
@sentry/browser (incl. Logs)	28.98 kB	-	-
@sentry/browser (incl. Metrics & Logs)	29.67 kB	-	-
@sentry/react	29.45 kB	-	-
@sentry/react (incl. Tracing)	48.72 kB	+0.1%	+46 B 🔺
@sentry/vue	33.08 kB	-	-
@sentry/vue (incl. Tracing)	48.44 kB	+0.1%	+45 B 🔺
@sentry/svelte	27.67 kB	-	-
CDN Bundle	30.05 kB	-	-
CDN Bundle (incl. Tracing)	48.44 kB	+0.08%	+36 B 🔺
CDN Bundle (incl. Logs, Metrics)	31.64 kB	-	-
CDN Bundle (incl. Tracing, Logs, Metrics)	49.74 kB	+0.08%	+37 B 🔺
CDN Bundle (incl. Replay, Logs, Metrics)	70.87 kB	-	-
CDN Bundle (incl. Tracing, Replay)	85.93 kB	+0.04%	+33 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics)	87.24 kB	+0.04%	+32 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback)	91.73 kB	+0.04%	+30 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)	93 kB	+0.04%	+29 B 🔺
CDN Bundle - uncompressed	89.58 kB	-	-
CDN Bundle (incl. Tracing) - uncompressed	146.38 kB	+0.04%	+48 B 🔺
CDN Bundle (incl. Logs, Metrics) - uncompressed	94.29 kB	-	-
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed	150.35 kB	+0.04%	+48 B 🔺
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed	219.02 kB	-	-
CDN Bundle (incl. Tracing, Replay) - uncompressed	265.58 kB	+0.02%	+48 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed	269.54 kB	+0.02%	+48 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	279.29 kB	+0.02%	+48 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed	283.23 kB	+0.02%	+48 B 🔺
@sentry/nextjs (client)	51.27 kB	+0.1%	+47 B 🔺
@sentry/sveltekit (client)	46.9 kB	+0.09%	+38 B 🔺
@sentry/core/server	78.49 kB	+0.03%	+17 B 🔺
@sentry/core/browser	64.84 kB	+0.03%	+18 B 🔺
@sentry/node-core	62.79 kB	+0.01%	+2 B 🔺
@sentry/node	125.2 kB	-	-
@sentry/node (incl. diagnostics channel injection)	139.87 kB	-0.01%	-1 B 🔽
@sentry/node/import (ESM hook with diagnostics-channel injection)	69.96 kB	-	-
@sentry/node/light	50.8 kB	-	-
@sentry/node - without tracing	74.17 kB	+0.01%	+1 B 🔺
@sentry/aws-serverless	83.39 kB	+0.01%	+1 B 🔺
@sentry/cloudflare (withSentry) - minified	181.82 kB	+0.02%	+24 B 🔺
@sentry/cloudflare (withSentry)	450.07 kB	+0.03%	+95 B 🔺

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