Make Menu items on filters accessible through keyboard

Signed-off-by: Hamza El Aoutar <elaoutarhamza@gmail.com>

.changeset/witty-lions-reply.md

@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-catalog-react': patch
+---
+
+Make Menu item on filters accessible through keyboard

plugins/catalog-react/src/components/UserListPicker/UserListPicker.tsx

@@ -253,6 +253,7 @@ export const UserListPicker = (props: UserListPickerProps) => {
                   className={classes.menuItem}
                   disabled={filterCounts[item.id] === 0}
                   data-testid={`user-picker-${item.id}`}
+                  tabIndex={0}
                 >
                   {item.icon && (
                     <ListItemIcon className={classes.listIcon}>