[Discover][Unified Tabs] Rename "Tabs bar menu" to "Tabs menu" (elastic#243332)

(cherry picked from commit c620d11)

Author: akowalska622

src/platform/packages/shared/kbn-unified-tabs/src/components/tabs_bar_menu/tabs_bar_menu.tsx

@@ -80,7 +80,7 @@ export const TabsBarMenu: React.FC<TabsBarMenuProps> = React.memo(
     const contextMenuPopoverId = useGeneratedHtmlId();
 
     const menuButtonLabel = i18n.translate('unifiedTabs.tabsBarMenu.tabsBarMenuButton', {
-      defaultMessage: 'Tabs bar menu',
+      defaultMessage: 'Tabs menu',
     });
 
     const closePopover = useCallback(() => {