fix(cloudflare): Don't track negatively sampled spans

[Lms24]

supersedes #21349 for the time being. This does not fix the case where a spanStart event is emitted not a spanEnd event isn't. It only locally fixes an occurance of the symptom. We're gonna merge this first to resolve the cloudflare SDK bug but we'll need a more reliable fix than the one I hacked to gether in #21349.

See #21349 (comment)

[andreiborza]

LGTM

[github-actions]

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	27.21 kB	-	-
@sentry/browser - with treeshaking flags	25.65 kB	-	-
@sentry/browser (incl. Tracing)	45.51 kB	-	-
@sentry/browser (incl. Tracing + Span Streaming)	47.73 kB	-	-
@sentry/browser (incl. Tracing, Profiling)	50.29 kB	-	-
@sentry/browser (incl. Tracing, Replay)	84.71 kB	-	-
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	74.34 kB	-	-
@sentry/browser (incl. Tracing, Replay with Canvas)	89.41 kB	-	-
@sentry/browser (incl. Tracing, Replay, Feedback)	102.11 kB	-	-
@sentry/browser (incl. Feedback)	44.37 kB	-	-
@sentry/browser (incl. sendFeedback)	32.03 kB	-	-
@sentry/browser (incl. FeedbackAsync)	37.12 kB	-	-
@sentry/browser (incl. Metrics)	28.28 kB	-	-
@sentry/browser (incl. Logs)	28.53 kB	-	-
@sentry/browser (incl. Metrics & Logs)	29.22 kB	-	-
@sentry/react	29.02 kB	-	-
@sentry/react (incl. Tracing)	47.78 kB	-	-
@sentry/vue	32.22 kB	-	-
@sentry/vue (incl. Tracing)	47.4 kB	-	-
@sentry/svelte	27.23 kB	-	-
CDN Bundle	29.58 kB	-	-
CDN Bundle (incl. Tracing)	47.95 kB	-	-
CDN Bundle (incl. Logs, Metrics)	31.09 kB	-	-
CDN Bundle (incl. Tracing, Logs, Metrics)	49.2 kB	-	-
CDN Bundle (incl. Replay, Logs, Metrics)	70.37 kB	-	-
CDN Bundle (incl. Tracing, Replay)	85.34 kB	-	-
CDN Bundle (incl. Tracing, Replay, Logs, Metrics)	86.52 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback)	91.16 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)	92.34 kB	-	-
CDN Bundle - uncompressed	87.78 kB	-	-
CDN Bundle (incl. Tracing) - uncompressed	144.98 kB	-	-
CDN Bundle (incl. Logs, Metrics) - uncompressed	92.27 kB	-	-
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed	148.74 kB	-	-
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed	217.08 kB	-	-
CDN Bundle (incl. Tracing, Replay) - uncompressed	263.85 kB	-	-
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed	267.59 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	277.55 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed	281.28 kB	-	-
@sentry/nextjs (client)	50.26 kB	-	-
@sentry/sveltekit (client)	45.92 kB	-	-
@sentry/core/server	75.96 kB	-	-
@sentry/core/browser	63.1 kB	-	-
@sentry/node-core	61.73 kB	+0.01%	+3 B 🔺
@sentry/node	130.42 kB	-	-
@sentry/node - without tracing	74.1 kB	-	-
@sentry/aws-serverless	86.29 kB	-	-
@sentry/cloudflare (withSentry) - minified	173.69 kB	+0.01%	+8 B 🔺
@sentry/cloudflare (withSentry)	433.85 kB	+0.02%	+58 B 🔺

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