Refactor code for consistency and readability

- Standardized string quotes across multiple files to use double quotes for consistency.
- Improved formatting of JSON dumps in mock data for better readability.
- Enhanced the structure of various functions and data definitions for clarity.
- Updated test cases to reflect changes in data structure and ensure accuracy.

dashboard/tests/test_flavor.py

@@ -1,4 +1,5 @@
 """Tests for dashboard.openstack_utils.flavor."""
+
 from unittest.mock import MagicMock
 
 from django.test import TestCase