fix(browser): Ensure standalone CLS and LCP spans have traceId of pageload span

[Lms24]

builds on top of #16863

this PR fixes a bug in standalone web vital spans where, if they were sent because of a navigation, they would incorrectly be added to the navigation span's trace instead of the initial pageload span's trace. This surfaced while dogfooding these spans on sentry and inspecting them in the EAP traceview.

To fix this, I added a lifecycle hook in #16863 that triggers right before we start preparing the navigation span and hence, right before we recycle the propagation context to the new traceId. This PR now makes use of the new hook for CLS and LCP spans and it also makes the integration tests stricter to check for the correct trace ids.

[github-actions]

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	23.81 kB	-	-
@sentry/browser - with treeshaking flags	22.53 kB	-	-
@sentry/browser (incl. Tracing)	39.66 kB	-	-
@sentry/browser (incl. Tracing, Replay)	77.79 kB	-	-
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	67.73 kB	-	-
@sentry/browser (incl. Tracing, Replay with Canvas)	82.49 kB	+0.01%	+1 B 🔺
@sentry/browser (incl. Tracing, Replay, Feedback)	94.61 kB	-	-
@sentry/browser (incl. Feedback)	40.48 kB	-	-
@sentry/browser (incl. sendFeedback)	28.49 kB	-	-
@sentry/browser (incl. FeedbackAsync)	33.38 kB	-	-
@sentry/react	25.58 kB	-	-
@sentry/react (incl. Tracing)	41.64 kB	+0.01%	+2 B 🔺
@sentry/vue	28.26 kB	-	-
@sentry/vue (incl. Tracing)	41.46 kB	+0.01%	+2 B 🔺
@sentry/svelte	23.83 kB	-	-
CDN Bundle	25.36 kB	-	-
CDN Bundle (incl. Tracing)	39.63 kB	+0.01%	+3 B 🔺
CDN Bundle (incl. Tracing, Replay)	75.57 kB	+0.01%	+5 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback)	81.02 kB	+0.01%	+3 B 🔺
CDN Bundle - uncompressed	74.08 kB	-	-
CDN Bundle (incl. Tracing) - uncompressed	117.7 kB	+0.02%	+12 B 🔺
CDN Bundle (incl. Tracing, Replay) - uncompressed	231.62 kB	+0.01%	+12 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	244.44 kB	+0.01%	+12 B 🔺
@sentry/nextjs (client)	43.28 kB	+0.01%	+2 B 🔺
@sentry/sveltekit (client)	40.11 kB	-	-
@sentry/node	167.85 kB	+0.01%	+1 B 🔺
@sentry/node - without tracing	100.59 kB	-	-
@sentry/aws-serverless	128.69 kB	-	-

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