Read messages count from backend

Author: germanosin

frontend/src/components/Topics/List/TopicTable.tsx

@@ -74,17 +74,8 @@ const TopicTable: React.FC = () => {
       {
         id: TopicColumnsToSort.MESSAGES_COUNT,
         header: 'Number of messages',
-        accessorKey: 'partitions',
+        accessorKey: 'messageCount',
         size: 146,
-        cell: ({ getValue }) => {
-          const partitions = getValue<Topic['partitions']>();
-          if (partitions === undefined || partitions.length === 0) {
-            return 0;
-          }
-          return partitions.reduce((memo, { offsetMax, offsetMin }) => {
-            return memo + (offsetMax - offsetMin);
-          }, 0);
-        },
       },
       {
         id: TopicColumnsToSort.SIZE,