feat(node): fetch breadcrumbs without tracing

[timfish]

#14019 should be merged before this to ensure the tests are actually passing!

This PR adds the fetchBreadcrumbsIntegration and enables it by default. This integration captures fetch (and undici) breadcrumbs without the need to enable tracing.

Setting the fetchBreadcrumbs init option to false disables this integration. I added a top-level config option because this integration is enabled by default and we need a simple way to disable it.

The breadcrumbs option for nativeNodeFetchIntegration has been deprecated but to preserve backwards compatibility, this property also disables the new integration.

[github-actions]

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	22.73 KB	-	-
@sentry/browser - with treeshaking flags	21.53 KB	-	-
@sentry/browser (incl. Tracing)	35.12 KB	-	-
@sentry/browser (incl. Tracing, Replay)	71.86 KB	-	-
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	62.26 KB	-	-
@sentry/browser (incl. Tracing, Replay with Canvas)	76.21 KB	-	-
@sentry/browser (incl. Tracing, Replay, Feedback)	88.99 KB	-0.01%	-1 B 🔽
@sentry/browser (incl. Tracing, Replay, Feedback, metrics)	90.82 KB	-0.01%	-1 B 🔽
@sentry/browser (incl. metrics)	27 KB	-	-
@sentry/browser (incl. Feedback)	39.87 KB	-	-
@sentry/browser (incl. sendFeedback)	27.38 KB	-	-
@sentry/browser (incl. FeedbackAsync)	32.17 KB	-	-
@sentry/react	25.49 KB	-	-
@sentry/react (incl. Tracing)	38.09 KB	-	-
@sentry/vue	26.91 KB	-	-
@sentry/vue (incl. Tracing)	37.02 KB	-	-
@sentry/svelte	22.87 KB	-	-
CDN Bundle	24.11 KB	-	-
CDN Bundle (incl. Tracing)	36.96 KB	-	-
CDN Bundle (incl. Tracing, Replay)	71.65 KB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback)	76.99 KB	-	-
CDN Bundle - uncompressed	70.7 KB	-	-
CDN Bundle (incl. Tracing) - uncompressed	109.73 KB	-	-
CDN Bundle (incl. Tracing, Replay) - uncompressed	222.24 KB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	235.46 KB	-	-
@sentry/nextjs (client)	38.06 KB	-	-
@sentry/sveltekit (client)	35.74 KB	-	-
@sentry/node	125.26 KB	+0.09%	+113 B 🔺
@sentry/node - without tracing	94.36 KB	+0.12%	+110 B 🔺
@sentry/aws-serverless	103.89 KB	+0.08%	+83 B 🔺

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