limit the size of the loading and unable-to-connect states for cluster monitoring

app/assets/stylesheets/pages/environments.scss

@@ -383,6 +383,16 @@
   }
 }
 
+#cluster-health .prometheus-state {
+  .state-svg img {
+    max-height: 120px;
+  }
+  .state-description,
+  .state-button {
+    display: none;
+  }
+}
+
 .environments-actions {
   .external-url,
   .monitoring-url,