fix(core): Preserve propagation across ignored spans

[Lms24]

This PR preserves trace propagation for ignored spans in span streaming mode:

• When segment spans are ignored, incoming DSC (via baggage) is kept as-is, but is mutated to carry a negative sampling decision, in line with the sentry-trace header, which already emitted a negative sampling decision
• ignored child and HTTP client spans propagate from the nearest emitted parent across fetch, node:http
  • For Orchestrion/tracing-channel-based instrumentation, we only set a child span as the active span if it is not ignored. This was already implemented in the OTel context manager previously but probably didn't get ported correctly to the new approach.

Turns out, the DSC changes are also a requirement for #22246, so I threw it on top of this PR.

ref #22262

[github-actions]

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	27.72 kB	+0.18%	+49 B 🔺
@sentry/browser - with treeshaking flags	26.17 kB	+0.19%	+48 B 🔺
@sentry/browser (incl. Tracing)	46.49 kB	+0.11%	+47 B 🔺
@sentry/browser (incl. Tracing + Span Streaming)	48.28 kB	+0.1%	+46 B 🔺
@sentry/browser (incl. Tracing, Profiling)	51.27 kB	+0.09%	+46 B 🔺
@sentry/browser (incl. Tracing, Replay)	85.74 kB	+0.06%	+44 B 🔺
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	75.38 kB	+0.07%	+49 B 🔺
@sentry/browser (incl. Tracing, Replay with Canvas)	90.45 kB	+0.06%	+46 B 🔺
@sentry/browser (incl. Tracing, Replay, Feedback)	103.11 kB	+0.05%	+45 B 🔺
@sentry/browser (incl. Feedback)	44.9 kB	+0.11%	+46 B 🔺
@sentry/browser (incl. sendFeedback)	32.52 kB	+0.15%	+46 B 🔺
@sentry/browser (incl. FeedbackAsync)	37.65 kB	+0.13%	+47 B 🔺
@sentry/browser (incl. Metrics)	28.81 kB	+0.16%	+46 B 🔺
@sentry/browser (incl. Logs)	29.05 kB	+0.17%	+47 B 🔺
@sentry/browser (incl. Metrics & Logs)	29.73 kB	+0.17%	+49 B 🔺
@sentry/react	29.53 kB	+0.17%	+49 B 🔺
@sentry/react (incl. Tracing)	48.75 kB	+0.11%	+49 B 🔺
@sentry/vue	33.15 kB	+0.15%	+47 B 🔺
@sentry/vue (incl. Tracing)	48.46 kB	+0.09%	+42 B 🔺
@sentry/svelte	27.75 kB	+0.19%	+50 B 🔺
CDN Bundle	30.12 kB	+0.16%	+46 B 🔺
CDN Bundle (incl. Tracing)	48.47 kB	+0.09%	+42 B 🔺
CDN Bundle (incl. Logs, Metrics)	31.7 kB	+0.17%	+51 B 🔺
CDN Bundle (incl. Tracing, Logs, Metrics)	49.78 kB	+0.09%	+44 B 🔺
CDN Bundle (incl. Replay, Logs, Metrics)	70.94 kB	+0.08%	+50 B 🔺
CDN Bundle (incl. Tracing, Replay)	85.97 kB	+0.06%	+44 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics)	87.28 kB	+0.06%	+46 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback)	91.77 kB	+0.06%	+54 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)	93.03 kB	+0.06%	+48 B 🔺
CDN Bundle - uncompressed	89.78 kB	+0.09%	+80 B 🔺
CDN Bundle (incl. Tracing) - uncompressed	146.54 kB	+0.07%	+95 B 🔺
CDN Bundle (incl. Logs, Metrics) - uncompressed	94.48 kB	+0.09%	+80 B 🔺
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed	150.51 kB	+0.07%	+95 B 🔺
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed	219.21 kB	+0.04%	+80 B 🔺
CDN Bundle (incl. Tracing, Replay) - uncompressed	265.74 kB	+0.04%	+95 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed	269.7 kB	+0.04%	+95 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	279.44 kB	+0.04%	+95 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed	283.39 kB	+0.04%	+95 B 🔺
@sentry/nextjs (client)	51.3 kB	+0.11%	+55 B 🔺
@sentry/sveltekit (client)	46.93 kB	+0.11%	+50 B 🔺
@sentry/core/server	78.58 kB	+0.06%	+42 B 🔺
@sentry/core/browser	64.93 kB	+0.07%	+40 B 🔺
@sentry/node-core	63.17 kB	-0.29%	-179 B 🔽
@sentry/node	125.41 kB	+0.06%	+65 B 🔺
@sentry/node (incl. diagnostics channel injection)	140.46 kB	+0.05%	+59 B 🔺
@sentry/node/import (ESM hook with diagnostics-channel injection)	70.03 kB	-	-
@sentry/node/light	51.3 kB	+0.09%	+42 B 🔺
@sentry/node - without tracing	74.67 kB	+0.05%	+30 B 🔺
@sentry/aws-serverless	83.9 kB	+0.04%	+26 B 🔺
@sentry/cloudflare (withSentry) - minified	182 kB	+0.06%	+91 B 🔺
@sentry/cloudflare (withSentry)	450.59 kB	+0.08%	+341 B 🔺

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[Lms24]

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[JPeer264]

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