fix(cloudflare): avoid repeated flush lock wrapping

[logaretm]

Durable Objects can reuse the same instrumented context across many requests. makeFlushLock() replaced context.waitUntil on every init, so each request wrapped the previous wrapper and built an unbounded call chain.

A later waitUntil() call then had to recurse through every wrapper, eventually causing stack overflows and retaining stale closures.

I added a mechanism to reuse a single waitUntil wrapper per Cloudflare context instead of wrapping again on every SDK init. Also added a regression coverage for long-lived contexts repeatedly creating flush locks.

Fixes #21150

[linear-code]

JS-2605

[github-actions]

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	27.32 kB	-	-
@sentry/browser - with treeshaking flags	25.74 kB	-	-
@sentry/browser (incl. Tracing)	45.31 kB	-	-
@sentry/browser (incl. Tracing + Span Streaming)	47.55 kB	-	-
@sentry/browser (incl. Tracing, Profiling)	50.3 kB	-	-
@sentry/browser (incl. Tracing, Replay)	84.92 kB	-	-
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	74.43 kB	-	-
@sentry/browser (incl. Tracing, Replay with Canvas)	89.64 kB	-	-
@sentry/browser (incl. Tracing, Replay, Feedback)	102.24 kB	-	-
@sentry/browser (incl. Feedback)	44.51 kB	-	-
@sentry/browser (incl. sendFeedback)	32.13 kB	-	-
@sentry/browser (incl. FeedbackAsync)	37.25 kB	-	-
@sentry/browser (incl. Metrics)	28.41 kB	-	-
@sentry/browser (incl. Logs)	28.64 kB	-	-
@sentry/browser (incl. Metrics & Logs)	29.33 kB	-	-
@sentry/react	29.05 kB	-	-
@sentry/react (incl. Tracing)	47.55 kB	-	-
@sentry/vue	32.24 kB	-	-
@sentry/vue (incl. Tracing)	47.17 kB	-	-
@sentry/svelte	27.35 kB	-	-
CDN Bundle	29.73 kB	-	-
CDN Bundle (incl. Tracing)	47.84 kB	-	-
CDN Bundle (incl. Logs, Metrics)	31.21 kB	-	-
CDN Bundle (incl. Tracing, Logs, Metrics)	49.09 kB	-	-
CDN Bundle (incl. Replay, Logs, Metrics)	70.53 kB	-	-
CDN Bundle (incl. Tracing, Replay)	85.34 kB	-	-
CDN Bundle (incl. Tracing, Replay, Logs, Metrics)	86.5 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback)	91.2 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)	92.37 kB	-	-
CDN Bundle - uncompressed	87.8 kB	-	-
CDN Bundle (incl. Tracing) - uncompressed	144.29 kB	-	-
CDN Bundle (incl. Logs, Metrics) - uncompressed	92.29 kB	-	-
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed	148.05 kB	-	-
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed	217.02 kB	-	-
CDN Bundle (incl. Tracing, Replay) - uncompressed	263.07 kB	-	-
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed	266.81 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	276.77 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed	280.5 kB	-	-
@sentry/nextjs (client)	50.03 kB	-	-
@sentry/sveltekit (client)	45.8 kB	-	-
@sentry/core/server	76.48 kB	-	-
@sentry/core/browser	63.23 kB	-	-
@sentry/node-core	62.59 kB	+0.01%	+2 B 🔺
@sentry/node	131.1 kB	-	-
@sentry/node - without tracing	75.02 kB	-	-
@sentry/aws-serverless	87.24 kB	-	-
@sentry/cloudflare (withSentry) - minified	173.52 kB	+0.23%	+390 B 🔺
@sentry/cloudflare (withSentry)	433.52 kB	+0.26%	+1.09 kB 🔺

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