feat(admin): malware insights (#19314)

Author: miketheman

tests/unit/admin/test_routes.py

@@ -416,6 +416,11 @@ def test_includeme():
             "/admin/observers/{observer_id}/",
             domain=warehouse,
         ),
+        pretend.call(
+            "admin.observations.insights",
+            "/admin/observations/insights/",
+            domain=warehouse,
+        ),
         pretend.call(
             "admin.observations.list",
             "/admin/observations/",