fix(metrics): compute the weekly email without the query cache

The Saturday email read through the metrics query cache and could serve
stale values; compute it fresh (use_cache=False) so the email and the
freshly warmed dashboard cache match.

Signed-off-by: Alan Peixinho <alan.peixinho@profusion.mobi>
Co-authored-by: Cursor <cursoragent@cursor.com>

Author: alanpeixinho

backend/kernelCI_app/management/commands/notifications.py

@@ -860,6 +860,7 @@ def generate_metrics_report(
     data: MetricsReportData = get_metrics_data(
         start_days_ago=start_days_ago,
         end_days_ago=end_days_ago,
+        use_cache=False,
     )
 
     deltas = compute_metrics_deltas(data)

backend/kernelCI_app/tests/unitTests/commands/metrics_notifications_test.py

@@ -224,7 +224,9 @@ def test_default_success(self, mock_instance, mock_get, mock_template, mock_send
         mock_get.return_value = make_metrics_data()
         mock_template.return_value.render.return_value = "rendered content"
         generate_metrics_report(email_service=MagicMock(), email_args=MagicMock())
-        mock_get.assert_called_once_with(start_days_ago=7, end_days_ago=0)
+        mock_get.assert_called_once_with(
+            start_days_ago=7, end_days_ago=0, use_cache=False
+        )
         mock_template.assert_called_once_with("metrics_report.txt.j2")
         mock_instance.assert_called_once()
         mock_send.assert_called_once()