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_mock_data.py

@@ -1,4 +1,5 @@
 """Tests for dashboard.mock_data."""
+
 import json
 
 from django.test import TestCase
@@ -11,7 +12,17 @@ class GetMockContextTest(TestCase):
 
     def test_returns_all_top_level_keys(self):
         ctx = get_mock_context()
-        expected_keys = {"region", "pcpu", "vcpu", "pram", "vram", "vm", "flavors", "audits", "current_cluster"}
+        expected_keys = {
+            "region",
+            "pcpu",
+            "vcpu",
+            "pram",
+            "vram",
+            "vm",
+            "flavors",
+            "audits",
+            "current_cluster",
+        }
         self.assertEqual(set(ctx.keys()), expected_keys)
 
     def test_region_structure(self):