fix: Add service containers and fix test failures

- Add Redis and RabbitMQ services to CI workflow
- Fix Jinja2 template error by passing file=None in error cases
- Fix test expecting dict response format for list_files endpoint
- Fix NOT NULL constraint by providing valid local_filename
- Fix retry-subtask to validate subtask name before checking processed file
- Add mock for process_document in reprocess test

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

frontend/templates/file_detail.html

@@ -466,6 +466,7 @@
       cursor: not-allowed;
     }
   </style>
+  {% if file %}
   <script>
     // JavaScript for handling retry functionality
     async function reprocessFile() {
@@ -590,6 +591,7 @@
       }
     }
   </script>
+  {% endif %}
 {% endblock %}
 
 {% block content %}