fix: Export logger from sveltekit worker (#16716)

### Issue

The `logger` was missing from SvelteKit's worker environment exports,
causing `Sentry.logger` to be `null` when deploying to Cloudflare Pages.
Users experienced:
- `Sentry.logger` is `null` in production 
- `logger.info()` throws access violations
- Works fine locally but fails in Cloudflare Pages deployment

Cloudflare Pages uses the **worker runtime environment** (not Node.js)
when `@sveltejs/adapter-cloudflare` is configured which is why logger
must be exported from there.

[official Cloudflare Pages Functions
documentation](https://developers.cloudflare.com/pages/functions/)

https://developers.cloudflare.com/pages/framework-guides/deploy-a-svelte-kit-site/#functions-setup

Author: RulaKhaled

packages/sveltekit/src/worker/index.ts

@@ -49,6 +49,7 @@ export {
   isEnabled,
   lastEventId,
   linkedErrorsIntegration,
+  logger,
   requestDataIntegration,
   rewriteFramesIntegration,
   Scope,