ref(deno): Refactor deno integration to avoid setupOnce

[mydea]

Slowly getting rid of getCurrentHub()...

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser (incl. Tracing, Replay, Feedback) - Webpack (gzipped)	75.17 KB (+0.03% 🔺)
@sentry/browser (incl. Tracing, Replay) - Webpack (gzipped)	66.6 KB (+0.03% 🔺)
@sentry/browser (incl. Tracing, Replay) - Webpack with treeshaking flags (gzipped)	60.19 KB (+0.03% 🔺)
@sentry/browser (incl. Tracing) - Webpack (gzipped)	31.26 KB (0%)
@sentry/browser (incl. Feedback) - Webpack (gzipped)	29.87 KB (0%)
@sentry/browser - Webpack (gzipped)	21.56 KB (0%)
@sentry/browser (incl. Tracing, Replay, Feedback) - ES6 CDN Bundle (gzipped)	72.61 KB (+0.03% 🔺)
@sentry/browser (incl. Tracing, Replay) - ES6 CDN Bundle (gzipped)	64.33 KB (+0.03% 🔺)
@sentry/browser (incl. Tracing) - ES6 CDN Bundle (gzipped)	30.57 KB (0%)
@sentry/browser - ES6 CDN Bundle (gzipped)	22.63 KB (0%)
@sentry/browser (incl. Tracing, Replay) - ES6 CDN Bundle (minified & uncompressed)	202.3 KB (+0.02% 🔺)
@sentry/browser (incl. Tracing) - ES6 CDN Bundle (minified & uncompressed)	92.4 KB (0%)
@sentry/browser - ES6 CDN Bundle (minified & uncompressed)	67.45 KB (0%)
@sentry/browser (incl. Tracing) - ES5 CDN Bundle (gzipped)	33.47 KB (0%)
@sentry/react (incl. Tracing, Replay) - Webpack (gzipped)	66.96 KB (+0.03% 🔺)
@sentry/react - Webpack (gzipped)	21.6 KB (0%)
@sentry/nextjs Client (incl. Tracing, Replay) - Webpack (gzipped)	83.74 KB (+0.03% 🔺)
@sentry/nextjs Client - Webpack (gzipped)	48.41 KB (0%)
@sentry-internal/feedback - Webpack (gzipped)	16.18 KB (0%)