feat(core): Deprecate spanId on propagationContext

[mydea]

This PR deprecates setting & reading the spanId on the propagation context, as well as generatePropagationContext().

Instead, you can/should now omit the spanId: scope.setPropagationContext({ traceId: generateTraceId() }), which will under the hood generate a new random span ID for the time being.

This PR does not change any behavior about using the spanId, but adds comments for where we want to replace this in v9 - there, we'll just generate new span IDs on the fly in these cases instead of using the one from propagation context. The propagation context will only hold traceId & parentSpanId (optionally).

Closes #14255

[github-actions]

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	23.13 KB	+0.13%	+30 B 🔺
@sentry/browser - with treeshaking flags	21.84 KB	+0.13%	+29 B 🔺
@sentry/browser (incl. Tracing)	35.7 KB	+0.07%	+23 B 🔺
@sentry/browser (incl. Tracing, Replay)	72.58 KB	+0.02%	+14 B 🔺
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	62.99 KB	+0.03%	+19 B 🔺
@sentry/browser (incl. Tracing, Replay with Canvas)	76.91 KB	+0.02%	+13 B 🔺
@sentry/browser (incl. Tracing, Replay, Feedback)	89.37 KB	+0.03%	+21 B 🔺
@sentry/browser (incl. Feedback)	39.85 KB	+0.05%	+19 B 🔺
@sentry/browser (incl. sendFeedback)	27.73 KB	+0.02%	+5 B 🔺
@sentry/browser (incl. FeedbackAsync)	32.52 KB	+0.06%	+18 B 🔺
@sentry/react	25.8 KB	+0.1%	+25 B 🔺
@sentry/react (incl. Tracing)	38.53 KB	+0.08%	+28 B 🔺
@sentry/vue	27.3 KB	+0.11%	+29 B 🔺
@sentry/vue (incl. Tracing)	37.49 KB	+0.01%	+2 B 🔺
@sentry/svelte	23.27 KB	+0.06%	+14 B 🔺
CDN Bundle	24.32 KB	+0.18%	+43 B 🔺
CDN Bundle (incl. Tracing)	37.34 KB	+0.12%	+43 B 🔺
CDN Bundle (incl. Tracing, Replay)	72.22 KB	+0.04%	+29 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback)	77.56 KB	+0.05%	+32 B 🔺
CDN Bundle - uncompressed	71.43 KB	+0.12%	+82 B 🔺
CDN Bundle (incl. Tracing) - uncompressed	110.78 KB	+0.1%	+112 B 🔺
CDN Bundle (incl. Tracing, Replay) - uncompressed	223.85 KB	+0.05%	+112 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	237.06 KB	+0.05%	+112 B 🔺
@sentry/nextjs (client)	38.85 KB	+0.07%	+25 B 🔺
@sentry/sveltekit (client)	36.21 KB	+0.08%	+27 B 🔺
@sentry/node	134.81 KB	+0.02%	+25 B 🔺
@sentry/node - without tracing	96.64 KB	+0.03%	+28 B 🔺
@sentry/aws-serverless	106.85 KB	+0.02%	+20 B 🔺

View base workflow run