feat(workflow): add configurable workflow file upload limit (#10176)

Co-authored-by: JzoNg <jzongcode@gmail.com>

api/configs/feature/__init__.py

@@ -269,6 +269,11 @@ class FileUploadConfig(BaseSettings):
         default=20,
     )
 
+    WORKFLOW_FILE_UPLOAD_LIMIT: PositiveInt = Field(
+        description="Maximum number of files allowed in a workflow upload operation",
+        default=10,
+    )
+
 
 class HttpConfig(BaseSettings):
     """