feat(astro): Re-export getInstrumentedModuleNames

Astro's runtime entry curates its `@sentry/node` re-exports (it can't
`export *`), so it needs the explicit listing like the other SDKs.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: mydea

packages/astro/src/index.server.ts

@@ -185,6 +185,7 @@ export {
   withStreamedSpan,
   metrics,
   eveConversationHook,
+  getInstrumentedModuleNames,
 } from '@sentry/node';
 
 export { init } from './server/sdk';