fix(sveltekit): Explicitly export Node SDK exports

[Lms24]

This PR fixes Node SDK exports not being available in prod builds. For example, calling Sentry.withScope(...) throws an error because withScope is not defined on the top-level namespace. This is because for CJS, Vite puts wildcard-exported properties into the default property rather than onto the namespace in production builds.

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser - ES5 CDN Bundle (gzipped + minified)	20.62 KB (-0.02% 🔽)
@sentry/browser - ES5 CDN Bundle (minified)	64.4 KB (0%)
@sentry/browser - ES6 CDN Bundle (gzipped + minified)	19.15 KB (-0.01% 🔽)
@sentry/browser - ES6 CDN Bundle (minified)	56.78 KB (0%)
@sentry/browser - Webpack (gzipped + minified)	21.53 KB (0%)
@sentry/browser - Webpack (minified)	72 KB (0%)
@sentry/react - Webpack (gzipped + minified)	21.55 KB (0%)
@sentry/nextjs Client - Webpack (gzipped + minified)	51.98 KB (0%)
@sentry/browser + @sentry/tracing - ES5 CDN Bundle (gzipped + minified)	28.16 KB (-0.01% 🔽)
@sentry/browser + @sentry/tracing - ES6 CDN Bundle (gzipped + minified)	26.36 KB (-0.01% 🔽)
@sentry/replay ES6 CDN Bundle (gzipped + minified)	44.74 KB (0%)
@sentry/replay - Webpack (gzipped + minified)	38.86 KB (0%)
@sentry/browser + @sentry/tracing + @sentry/replay - ES6 CDN Bundle (gzipped + minified)	63.41 KB (-0.01% 🔽)
@sentry/browser + @sentry/replay - ES6 CDN Bundle (gzipped + minified)	56.49 KB (-0.01% 🔽)