fix: count non-dict items in outputs_count

Move count increment before isinstance(item, dict) check so that
non-dict output items (like text strings from PreviewAny node)
are included in outputs_count.

This aligns OSS Python with Cloud's Go implementation which uses
len(itemsArray) to count ALL items regardless of type.

Amp-Thread-ID: https://ampcode.com/threads/T-019c0bb5-14e0-744f-8808-1e57653f3ae3
Co-authored-by: Amp <amp@ampcode.com>

comfy_execution/jobs.py

@@ -171,9 +171,10 @@ def get_outputs_summary(outputs: dict) -> tuple[int, Optional[dict]]:
                 continue
 
             for item in items:
+                count += 1
+
                 if not isinstance(item, dict):
                     continue
-                count += 1
 
                 if preview_output is None and is_previewable(media_type, item):
                     enriched = {