ref: Remove unnecessary checks for SpanJSON.data existence

[mydea]

Since this was reworked in #14693 to always return something, we can safe some checks/fallbacks.

This most likely does not change all the things, but focuses on the places that were easy to find/replace.

[github-actions]

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	23.23 KB	-0.01%	-2 B 🔽
@sentry/browser - with treeshaking flags	21.9 KB	-0.01%	-2 B 🔽
@sentry/browser (incl. Tracing)	35.74 KB	-0.02%	-5 B 🔽
@sentry/browser (incl. Tracing, Replay)	72.99 KB	-0.01%	-4 B 🔽
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	63.39 KB	-0.02%	-7 B 🔽
@sentry/browser (incl. Tracing, Replay with Canvas)	77.39 KB	-0.01%	-6 B 🔽
@sentry/browser (incl. Tracing, Replay, Feedback)	89.78 KB	-0.01%	-5 B 🔽
@sentry/browser (incl. Feedback)	39.99 KB	-0.01%	-1 B 🔽
@sentry/browser (incl. sendFeedback)	27.83 KB	-0.01%	-2 B 🔽
@sentry/browser (incl. FeedbackAsync)	32.62 KB	-0.01%	-2 B 🔽
@sentry/react	25.93 KB	-0.01%	-2 B 🔽
@sentry/react (incl. Tracing)	38.6 KB	-0.02%	-5 B 🔽
@sentry/vue	27.47 KB	-0.01%	-2 B 🔽
@sentry/vue (incl. Tracing)	37.61 KB	-0.03%	-9 B 🔽
@sentry/svelte	23.39 KB	-0.02%	-4 B 🔽
CDN Bundle	24.39 KB	-0.01%	-1 B 🔽
CDN Bundle (incl. Tracing)	37.46 KB	-0.01%	-2 B 🔽
CDN Bundle (incl. Tracing, Replay)	72.54 KB	-0.01%	-5 B 🔽
CDN Bundle (incl. Tracing, Replay, Feedback)	77.92 KB	-0.01%	-5 B 🔽
CDN Bundle - uncompressed	71.63 KB	-0.01%	-4 B 🔽
CDN Bundle (incl. Tracing) - uncompressed	111 KB	-0.02%	-14 B 🔽
CDN Bundle (incl. Tracing, Replay) - uncompressed	225.05 KB	-0.01%	-14 B 🔽
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	238.26 KB	-0.01%	-14 B 🔽
@sentry/nextjs (client)	38.85 KB	-0.02%	-6 B 🔽
@sentry/sveltekit (client)	36.28 KB	-0.02%	-7 B 🔽
@sentry/node	162.77 KB	-0.06%	-95 B 🔽
@sentry/node - without tracing	99 KB	-0.03%	-21 B 🔽
@sentry/aws-serverless	126.72 KB	-0.02%	-22 B 🔽

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