ref(core): Make spanStreamingIntegration tree-shakeable via __SENTRY_TRACING__ flag

[Lms24]

Guards the automatic spanStreamingIntegration push behind __SENTRY_TRACING__ so that bundlers and CDN builds which compile tracing out can actually drop the integration. This should remove ~2KB of gzipped dead code for anyone who doesn't care about tracing.

TODO: Add a size check for a __SENTRY_TRACING__: false build

[github-actions]

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	30.03 kB	+0.71%	+209 B 🔺
@sentry/browser - with treeshaking flags	28.19 kB	+0.61%	+169 B 🔺
@sentry/browser (incl. Tracing)	47.27 kB	+0.37%	+173 B 🔺
@sentry/browser (incl. Tracing + Span Streaming)	47.29 kB	+0.41%	+189 B 🔺
@sentry/browser (incl. Tracing, Profiling)	51.99 kB	+0.35%	+178 B 🔺
@sentry/browser (incl. Tracing, Replay)	86.59 kB	+0.22%	+190 B 🔺
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	76.02 kB	+0.24%	+181 B 🔺
@sentry/browser (incl. Tracing, Replay with Canvas)	91.29 kB	+0.19%	+169 B 🔺
@sentry/browser (incl. Tracing, Replay, Feedback)	103.95 kB	+0.19%	+189 B 🔺
@sentry/browser (incl. Feedback)	47.36 kB	+0.49%	+228 B 🔺
@sentry/browser (incl. sendFeedback)	34.86 kB	+0.58%	+198 B 🔺
@sentry/browser (incl. FeedbackAsync)	39.97 kB	+0.53%	+210 B 🔺
@sentry/browser (incl. Metrics)	31.09 kB	+0.64%	+196 B 🔺
@sentry/browser (incl. Logs)	31.32 kB	+0.64%	+199 B 🔺
@sentry/browser (incl. Metrics & Logs)	31.99 kB	+0.61%	+192 B 🔺
@sentry/react	31.8 kB	+0.65%	+204 B 🔺
@sentry/react (incl. Tracing)	49.52 kB	+0.39%	+191 B 🔺
@sentry/vue	34.93 kB	+0.57%	+195 B 🔺
@sentry/vue (incl. Tracing)	49.24 kB	+0.39%	+187 B 🔺
@sentry/svelte	30.06 kB	+0.68%	+203 B 🔺
CDN Bundle	32.04 kB	+0.54%	+170 B 🔺
CDN Bundle (incl. Tracing)	47.58 kB	+0.26%	+123 B 🔺
CDN Bundle (incl. Logs, Metrics)	33.6 kB	+0.55%	+183 B 🔺
CDN Bundle (incl. Tracing, Logs, Metrics)	48.97 kB	+0.28%	+133 B 🔺
CDN Bundle (incl. Replay, Logs, Metrics)	72.93 kB	+0.21%	+150 B 🔺
CDN Bundle (incl. Tracing, Replay)	85.2 kB	+0.14%	+111 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics)	86.53 kB	+0.17%	+140 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback)	90.99 kB	+0.15%	+136 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)	92.3 kB	+0.14%	+126 B 🔺
CDN Bundle - uncompressed	95.49 kB	+0.48%	+449 B 🔺
CDN Bundle (incl. Tracing) - uncompressed	142.7 kB	+0.32%	+449 B 🔺
CDN Bundle (incl. Logs, Metrics) - uncompressed	100.2 kB	+0.46%	+449 B 🔺
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed	146.68 kB	+0.31%	+449 B 🔺
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed	224.96 kB	+0.2%	+449 B 🔺
CDN Bundle (incl. Tracing, Replay) - uncompressed	261.96 kB	+0.18%	+449 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed	265.93 kB	+0.17%	+449 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	275.67 kB	+0.17%	+449 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed	279.62 kB	+0.17%	+449 B 🔺
@sentry/nextjs (client)	52.1 kB	+0.34%	+174 B 🔺
@sentry/sveltekit (client)	47.7 kB	+0.4%	+188 B 🔺
@sentry/core/server	79.75 kB	+0.19%	+145 B 🔺
@sentry/core/browser	51.76 kB	+0.33%	+167 B 🔺
@sentry/node	121.45 kB	+0.14%	+160 B 🔺
@sentry/node/import (ESM hook with diagnostics-channel injection)	166 B	-	-
@sentry/node - without tracing	84.1 kB	-0.8%	-674 B 🔽
@sentry/aws-serverless	93.18 kB	+0.17%	+156 B 🔺
@sentry/cloudflare (withSentry) - minified	198.24 kB	+0.33%	+642 B 🔺
@sentry/cloudflare (withSentry)	487.23 kB	+0.3%	+1.45 kB 🔺

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