fix(core): Serialize streamed span status message to sentry.status.message attribute

[Lms24]

Fixes a semi-deliberate oversight (lol) from my end that caused span status messages to be discarded when creating a StreamedSpanJSON from a Span instance. The deliberate part was to get rid of complicated statuses overall. The oversight was that there's a good use case to augment an error status span with a message: We sometimes want to record that an operation tracked by a span errored but explicitly not capture an error for it (since users likely try/catch said operation). Classic example is Connection Refused for databases.

closes#21800

[github-actions]

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	27.48 kB	-	-
@sentry/browser - with treeshaking flags	25.91 kB	-	-
@sentry/browser (incl. Tracing)	46.07 kB	+0.14%	+61 B 🔺
@sentry/browser (incl. Tracing + Span Streaming)	47.81 kB	+0.11%	+50 B 🔺
@sentry/browser (incl. Tracing, Profiling)	50.83 kB	+0.08%	+38 B 🔺
@sentry/browser (incl. Tracing, Replay)	85.31 kB	+0.06%	+50 B 🔺
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	74.91 kB	+0.08%	+57 B 🔺
@sentry/browser (incl. Tracing, Replay with Canvas)	90 kB	+0.06%	+50 B 🔺
@sentry/browser (incl. Tracing, Replay, Feedback)	102.66 kB	+0.05%	+44 B 🔺
@sentry/browser (incl. Feedback)	44.66 kB	-	-
@sentry/browser (incl. sendFeedback)	32.26 kB	-	-
@sentry/browser (incl. FeedbackAsync)	37.4 kB	-	-
@sentry/browser (incl. Metrics)	28.54 kB	-	-
@sentry/browser (incl. Logs)	28.78 kB	-	-
@sentry/browser (incl. Metrics & Logs)	29.47 kB	-	-
@sentry/react	29.27 kB	-	-
@sentry/react (incl. Tracing)	48.37 kB	+0.1%	+48 B 🔺
@sentry/vue	32.7 kB	+0.13%	+40 B 🔺
@sentry/vue (incl. Tracing)	47.94 kB	+0.14%	+63 B 🔺
@sentry/svelte	27.5 kB	-	-
CDN Bundle	29.89 kB	-	-
CDN Bundle (incl. Tracing)	48 kB	+0.11%	+52 B 🔺
CDN Bundle (incl. Logs, Metrics)	31.44 kB	-	-
CDN Bundle (incl. Tracing, Logs, Metrics)	49.33 kB	+0.07%	+34 B 🔺
CDN Bundle (incl. Replay, Logs, Metrics)	70.77 kB	-	-
CDN Bundle (incl. Tracing, Replay)	85.5 kB	+0.06%	+43 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics)	86.78 kB	+0.06%	+51 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback)	91.31 kB	+0.07%	+58 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)	92.54 kB	+0.06%	+48 B 🔺
CDN Bundle - uncompressed	88.95 kB	-	-
CDN Bundle (incl. Tracing) - uncompressed	145.31 kB	+0.1%	+131 B 🔺
CDN Bundle (incl. Logs, Metrics) - uncompressed	93.65 kB	-	-
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed	149.28 kB	+0.09%	+131 B 🔺
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed	218.63 kB	-	-
CDN Bundle (incl. Tracing, Replay) - uncompressed	264.33 kB	+0.05%	+131 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed	268.29 kB	+0.05%	+131 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	278.02 kB	+0.05%	+131 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed	281.97 kB	+0.05%	+131 B 🔺
@sentry/nextjs (client)	50.75 kB	+0.09%	+42 B 🔺
@sentry/sveltekit (client)	46.46 kB	+0.11%	+47 B 🔺
@sentry/core/server	77.75 kB	+0.1%	+77 B 🔺
@sentry/core/browser	64.06 kB	+0.14%	+86 B 🔺
@sentry/node-core	61.47 kB	+0.09%	+50 B 🔺
@sentry/node	122.79 kB	+0.04%	+39 B 🔺
@sentry/node/import (ESM hook with diagnostics-channel injection)	69.95 kB	-	-
@sentry/node/light	50.45 kB	+0.13%	+61 B 🔺
@sentry/node - without tracing	73.2 kB	+0.09%	+65 B 🔺
@sentry/aws-serverless	84.09 kB	+0.09%	+69 B 🔺
@sentry/cloudflare (withSentry) - minified	180.62 kB	+0.09%	+162 B 🔺
@sentry/cloudflare (withSentry)	446.93 kB	+0.11%	+457 B 🔺

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[logaretm]

q: I know core doesn't have @sentry/conventions dependency yet, but just for the future we should probably import them from there.

[Lms24]

yup, we need to add conventions to core.