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_prometheus_query.py

@@ -1,5 +1,6 @@
 """Tests for dashboard.prometheus_utils.query."""
-from unittest.mock import patch, MagicMock
+
+from unittest.mock import MagicMock, patch
 
 from django.test import TestCase
 
@@ -12,13 +13,7 @@ class QueryPrometheusTest(TestCase):
     @patch("dashboard.prometheus_utils.query.requests.get")
     def test_single_result_returns_value_string(self, mock_get):
         mock_response = MagicMock()
-        mock_response.json.return_value = {
-            "data": {
-                "result": [
-                    {"value": ["1234567890", "42"]}
-                ]
-            }
-        }
+        mock_response.json.return_value = {"data": {"result": [{"value": ["1234567890", "42"]}]}}
         mock_response.raise_for_status = MagicMock()
         mock_get.return_value = mock_response