ref(core): Ensure non-recording root spans have frozen DSC

[mydea]

Otherwise, parts of the DSC will be missing - we try to make it as complete as we can.

Since the span cannot be updated anyhow (e.g. the name cannot be changed), we can safely freeze this at this time.

Extracted out of #14955

[github-actions]

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	23.07 KB	-	-
@sentry/browser - with treeshaking flags	21.73 KB	-	-
@sentry/browser (incl. Tracing)	35.6 KB	+0.14%	+48 B 🔺
@sentry/browser (incl. Tracing, Replay)	72.38 KB	+0.07%	+47 B 🔺
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	62.9 KB	+0.09%	+55 B 🔺
@sentry/browser (incl. Tracing, Replay with Canvas)	76.64 KB	+0.07%	+49 B 🔺
@sentry/browser (incl. Tracing, Replay, Feedback)	88.68 KB	+0.06%	+47 B 🔺
@sentry/browser (incl. Feedback)	39.34 KB	-	-
@sentry/browser (incl. sendFeedback)	27.7 KB	-	-
@sentry/browser (incl. FeedbackAsync)	32.51 KB	-	-
@sentry/react	25.76 KB	-	-
@sentry/react (incl. Tracing)	38.37 KB	+0.15%	+55 B 🔺
@sentry/vue	27.28 KB	+0.16%	+43 B 🔺
@sentry/vue (incl. Tracing)	37.43 KB	+0.17%	+65 B 🔺
@sentry/svelte	23.19 KB	-	-
CDN Bundle	24.35 KB	-	-
CDN Bundle (incl. Tracing)	35.92 KB	+0.17%	+62 B 🔺
CDN Bundle (incl. Tracing, Replay)	70.56 KB	+0.09%	+59 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback)	75.74 KB	+0.09%	+64 B 🔺
CDN Bundle - uncompressed	71.14 KB	-	-
CDN Bundle (incl. Tracing) - uncompressed	106.65 KB	+0.14%	+145 B 🔺
CDN Bundle (incl. Tracing, Replay) - uncompressed	217.66 KB	+0.07%	+145 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	230.34 KB	+0.07%	+145 B 🔺
@sentry/nextjs (client)	38.5 KB	+0.16%	+61 B 🔺
@sentry/sveltekit (client)	36.15 KB	+0.17%	+61 B 🔺
@sentry/node	161.77 KB	-0.01%	-1 B 🔽
@sentry/node - without tracing	97.54 KB	+0.01%	+1 B 🔺
@sentry/aws-serverless	127.42 KB	-	-

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