fix animation performance on kanban group virtualization (#5666)

web/core/components/issues/issue-layouts/kanban/default.tsx

@@ -193,6 +193,7 @@ export const KanBan: React.FC<IKanBan> = observer((props) => {
                       ignoreHeader
                       cardHeight={approximateCardHeight}
                       cardsInColumn={issueLength !== undefined && issueLength < 3 ? issueLength : 3}
+                      shouldAnimate={false}
                     />
                   }
                   defaultValue={groupIndex < 5 && subGroupIndex < 2}