feat(init): show feedback hint after successful setup (#430)

## Summary

After a successful `sentry init`, shows a hint reminding users they can
run `sentry feedback` to share their experience. Since we're early, the
message leans into that: "You're one of the first to try the new setup
wizard!"

Closes #429

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: betegon

src/lib/init/formatters.ts

@@ -75,6 +75,9 @@ export function formatResult(result: WorkflowRunResult): void {
   }
 
   log.info("Please review the changes above before committing.");
+  log.info(
+    "You're one of the first to try the new setup wizard! Run `sentry cli feedback` to let us know how it went."
+  );
 
   outro("Sentry SDK installed successfully!");
 }