Make sure that SidebarItems are also active when on sub route

.changeset/thick-scissors-notice.md

@@ -0,0 +1,5 @@
+---
+'@backstage/core': patch
+---
+
+Make sure that SidebarItems are also active when on sub route.

packages/core/src/layout/Sidebar/Items.tsx

@@ -215,7 +215,6 @@ export const SidebarItem = forwardRef<any, SidebarItemProps>((props, ref) => {
       {...childProps}
       activeClassName={classes.selected}
       to={props.to}
-      end
       ref={ref}
     >
       {content}