feat: Pass parentSampleRate to tracesSampler

[lforst]

Ref: #14932
Ref: getsentry/team-sdks#117

This PR mainly does 2 things:

• Pick up the sample_rate from the DSC and pass it to the tracesSampler as parentSampleRate
• "Unfreeze" or rather set the sample_rate for a DSC of a given span whenever we applied a sample rate to the span's root span. The sample_rate is equivalent to the sample rate the root span has been sampled with. This is to ensure that downstream services can reliably use the sample_rate in the DSC to pass it to the tracesSampler - like we do in this PR (kinda closing the loop).

[github-actions]

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	22.86 KB	-	-
@sentry/browser - with treeshaking flags	21.53 KB	-	-
@sentry/browser (incl. Tracing)	35.62 KB	+0.18%	+65 B 🔺
@sentry/browser (incl. Tracing, Replay)	72.42 KB	+0.08%	+57 B 🔺
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	62.9 KB	+0.07%	+44 B 🔺
@sentry/browser (incl. Tracing, Replay with Canvas)	76.68 KB	+0.08%	+60 B 🔺
@sentry/browser (incl. Tracing, Replay, Feedback)	88.69 KB	+0.07%	+63 B 🔺
@sentry/browser (incl. Feedback)	39.08 KB	-	-
@sentry/browser (incl. sendFeedback)	27.5 KB	-	-
@sentry/browser (incl. FeedbackAsync)	32.27 KB	-	-
@sentry/react	25.56 KB	-	-
@sentry/react (incl. Tracing)	38.41 KB	+0.14%	+54 B 🔺
@sentry/vue	27 KB	+0.22%	+58 B 🔺
@sentry/vue (incl. Tracing)	37.37 KB	+0.15%	+57 B 🔺
@sentry/svelte	22.99 KB	-	-
CDN Bundle	24.27 KB	-	-
CDN Bundle (incl. Tracing)	35.95 KB	+0.11%	+37 B 🔺
CDN Bundle (incl. Tracing, Replay)	70.59 KB	+0.06%	+43 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback)	75.72 KB	+0.06%	+40 B 🔺
CDN Bundle - uncompressed	70.81 KB	-	-
CDN Bundle (incl. Tracing) - uncompressed	106.52 KB	+0.1%	+101 B 🔺
CDN Bundle (incl. Tracing, Replay) - uncompressed	217.35 KB	+0.05%	+101 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	229.88 KB	+0.05%	+101 B 🔺
@sentry/nextjs (client)	38.52 KB	+0.15%	+56 B 🔺
@sentry/sveltekit (client)	36.16 KB	+0.16%	+58 B 🔺
@sentry/node	161.38 KB	+0.04%	+66 B 🔺
@sentry/node - without tracing	97.11 KB	+0.01%	+1 B 🔺
@sentry/aws-serverless	127.06 KB	+0.05%	+58 B 🔺

View base workflow run

[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
695	1	694	299

View the full list of 1 ❄️ flaky tests

tracing/request/fetch/test.ts should create spans for fetch requests

Flake rate in main: 11.11% (Passed 24 times, Failed 3 times)

Stack Traces | 10.1s run time

test.ts:7:11 should create spans for fetch requests

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