ref(core)!: Migrate to SENTRY_SEGMENT_NAME_SOURCE

[RulaKhaled]

Besides removing SEMANTIC_ATTRIBUTE_SENTRY_SOURCE and using SENTRY_SEGMENT_NAME_SOURCE instead, this PR also:

• Sets name source only on segment spans (per the Sentry segment name source convention) — e.g. updateName, HTTP server spans, and tRPC when it is the segment root
• Removes envelope-time backfill from sentry.source → sentry.segment.name.source in captureSpan

CI note: This PR alone is expected to fail CI. It will stay blocked until #23367 is merged into it — that split is intentional to keep the core changes easier to review.

Fixes #22259

[github-actions]

size-limit report 📦

⚠️ Warning: Base artifact is not the latest one, because the latest workflow run is not done yet. This may lead to incorrect results. Try to re-run all tests to get up to date results.

Path	Size	% Change	Change
@sentry/browser	30.27 kB	-0.1%	-29 B 🔽
@sentry/browser - with treeshaking flags	28.44 kB	-0.12%	-32 B 🔽
@sentry/browser - with treeshaking flags tracing without tracing	26.81 kB	-0.03%	-6 B 🔽
@sentry/browser (incl. Tracing)	48.53 kB	-0.03%	-10 B 🔽
@sentry/browser (incl. Tracing + Span Streaming)	48.55 kB	-0.01%	-4 B 🔽
@sentry/browser (incl. Tracing, Profiling)	51.41 kB	-0.04%	-20 B 🔽
@sentry/browser (incl. Tracing, Replay)	87.93 kB	-0.01%	-8 B 🔽
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	77.36 kB	+0.05%	+35 B 🔺
@sentry/browser (incl. Tracing, Replay with Canvas)	92.66 kB	-0.01%	-8 B 🔽
@sentry/browser (incl. Tracing, Replay, Feedback)	105.38 kB	+0.02%	+17 B 🔺
@sentry/browser (incl. Feedback)	47.61 kB	-0.08%	-37 B 🔽
@sentry/browser (incl. sendFeedback)	35.1 kB	-0.08%	-27 B 🔽
@sentry/browser (incl. FeedbackAsync)	40.25 kB	-0.07%	-27 B 🔽
@sentry/browser (incl. Metrics)	31.19 kB	-0.18%	-55 B 🔽
@sentry/browser (incl. Logs)	31.47 kB	-0.16%	-48 B 🔽
@sentry/browser (incl. Metrics & Logs)	32.1 kB	-0.14%	-45 B 🔽
@sentry/react	32.05 kB	-0.13%	-40 B 🔽
@sentry/react (incl. Tracing)	50.73 kB	+0.01%	+1 B 🔺
@sentry/vue	35.32 kB	+0.04%	+11 B 🔺
@sentry/vue (incl. Tracing)	50.49 kB	-0.02%	-6 B 🔽
@sentry/svelte	30.3 kB	-0.11%	-32 B 🔽
CDN Bundle	31.57 kB	-0.12%	-37 B 🔽
CDN Bundle (incl. Tracing)	48.86 kB	-0.02%	-6 B 🔽
CDN Bundle (incl. Logs, Metrics)	33.76 kB	-0.12%	-38 B 🔽
CDN Bundle (incl. Tracing, Logs, Metrics)	50.78 kB	-0.03%	-14 B 🔽
CDN Bundle (incl. Replay, Logs, Metrics)	74.3 kB	-0.02%	-10 B 🔽
CDN Bundle (incl. Tracing, Replay)	86.44 kB	-0.03%	-18 B 🔽
CDN Bundle (incl. Tracing, Replay, Logs, Metrics)	88.3 kB	+0.02%	+11 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback)	92.16 kB	-0.01%	-7 B 🔽
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)	94.09 kB	-0.03%	-19 B 🔽
CDN Bundle - uncompressed	93.76 kB	-0.09%	-83 B 🔽
CDN Bundle (incl. Tracing) - uncompressed	146.69 kB	-0.03%	-30 B 🔽
CDN Bundle (incl. Logs, Metrics) - uncompressed	100.06 kB	-0.09%	-83 B 🔽
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed	152.38 kB	-0.02%	-30 B 🔽
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed	229.02 kB	-0.03%	-57 B 🔽
CDN Bundle (incl. Tracing, Replay) - uncompressed	265.97 kB	-0.01%	-4 B 🔽
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed	271.65 kB	-0.01%	-4 B 🔽
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	279.67 kB	-0.01%	-4 B 🔽
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed	285.34 kB	-0.01%	-4 B 🔽
@sentry/nextjs (client)	53.28 kB	+0.05%	+25 B 🔺
@sentry/sveltekit (client)	48.95 kB	-0.03%	-11 B 🔽
@sentry/core/server	65.37 kB	+0.06%	+34 B 🔺
@sentry/core/browser	51.72 kB	+0.06%	+31 B 🔺
@sentry/node	117.93 kB	-0.01%	-6 B 🔽
@sentry/node/import (ESM hook with diagnostics-channel injection)	0 B	added	added
@sentry/node - without tracing	82.03 kB	-0.03%	-24 B 🔽
@sentry/aws-serverless	91.46 kB	-0.01%	-5 B 🔽
@sentry/cloudflare (withSentry) - minified	214.08 kB	+0.05%	+88 B 🔺
@sentry/cloudflare (withSentry)	528.61 kB	-0.04%	-161 B 🔽

View base workflow run

[RulaKhaled]

bugbot run

[cursor]

✅ Bugbot reviewed your changes and found no new issues!

Comment @cursor review or bugbot run to trigger another review on this PR

^{Reviewed by Cursor Bugbot for commit 9c2caf1. Configure here.}