chore: new inspected variable add to top position instead of bottom (#21793)

web/app/components/workflow/hooks/use-inspect-vars-crud.ts

         if (nodeInfo) {
           const index = draft.findIndex(node => node.nodeId === nodeId)
           if (index === -1) {
-            draft.push({
+            draft.unshift({
               nodeId,
               nodeType: nodeInfo.data.type,
               title: nodeInfo.data.title,