fix(cloudflare): Use original waitUntil to not create a deadlock

[JPeer264]

follow up to: #21156

This prevents a deadlock in the waitUntil, which happened in the sentry-mcp:

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[github-actions]

size-limit report 📦

⚠️Warning: Base artifact is not the latest one, because the latest workflow run is not done yet. This may lead to incorrect results. Try to re-run all tests to get up to date results.

Path	Size	% Change	Change
@sentry/browser	27.16 kB	-	-
@sentry/browser - with treeshaking flags	25.61 kB	-	-
@sentry/browser (incl. Tracing)	45.23 kB	-	-
@sentry/browser (incl. Tracing + Span Streaming)	47.47 kB	-	-
@sentry/browser (incl. Tracing, Profiling)	50.21 kB	-	-
@sentry/browser (incl. Tracing, Replay)	84.81 kB	-	-
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	74.38 kB	-	-
@sentry/browser (incl. Tracing, Replay with Canvas)	89.52 kB	-	-
@sentry/browser (incl. Tracing, Replay, Feedback)	102.14 kB	-	-
@sentry/browser (incl. Feedback)	44.33 kB	-	-
@sentry/browser (incl. sendFeedback)	31.98 kB	-	-
@sentry/browser (incl. FeedbackAsync)	37.07 kB	-	-
@sentry/browser (incl. Metrics)	28.24 kB	-	-
@sentry/browser (incl. Logs)	28.48 kB	-	-
@sentry/browser (incl. Metrics & Logs)	29.18 kB	-	-
@sentry/react	28.99 kB	-	-
@sentry/react (incl. Tracing)	47.5 kB	-	-
@sentry/vue	32.2 kB	-	-
@sentry/vue (incl. Tracing)	47.15 kB	-	-
@sentry/svelte	27.18 kB	-	-
CDN Bundle	29.55 kB	-	-
CDN Bundle (incl. Tracing)	47.81 kB	-	-
CDN Bundle (incl. Logs, Metrics)	31.05 kB	-	-
CDN Bundle (incl. Tracing, Logs, Metrics)	49.02 kB	-	-
CDN Bundle (incl. Replay, Logs, Metrics)	70.31 kB	-	-
CDN Bundle (incl. Tracing, Replay)	85.17 kB	-	-
CDN Bundle (incl. Tracing, Replay, Logs, Metrics)	86.34 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback)	91.05 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)	92.21 kB	-	-
CDN Bundle - uncompressed	87.56 kB	-	-
CDN Bundle (incl. Tracing) - uncompressed	144.03 kB	-	-
CDN Bundle (incl. Logs, Metrics) - uncompressed	92.04 kB	-	-
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed	147.78 kB	-	-
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed	216.77 kB	-	-
CDN Bundle (incl. Tracing, Replay) - uncompressed	262.8 kB	-	-
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed	266.55 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	276.5 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed	280.24 kB	-	-
@sentry/nextjs (client)	50.01 kB	-	-
@sentry/sveltekit (client)	45.66 kB	-	-
@sentry/core/server	75.9 kB	-	-
@sentry/core/browser	63.06 kB	-	-
@sentry/node-core	61.69 kB	-0.01%	-2 B 🔽
@sentry/node	130.14 kB	-	-
@sentry/node - without tracing	74.11 kB	-	-
@sentry/aws-serverless	86.34 kB	+0.01%	+1 B 🔺
@sentry/cloudflare (withSentry) - minified	170.71 kB	+0.08%	+121 B 🔺
@sentry/cloudflare (withSentry)	427.26 kB	+0.08%	+310 B 🔺

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