Menu: Change left/right padding to `12px` (#97033)

* Menu: Change left/right padding to `12px`

* add border radius

* fix wrong rebase

packages/grafana-ui/src/components/Menu/MenuItem.tsx

@@ -222,8 +222,9 @@ const getStyles = (theme: GrafanaTheme2) => {
       flexDirection: 'column',
       alignItems: 'stretch',
       justifyContent: 'center',
-      padding: theme.spacing(0.5, 2),
+      padding: theme.spacing(0.5, 1.5),
       minHeight: theme.spacing(4),
+      borderRadius: theme.shape.radius.default,
       margin: 0,
       border: 'none',
       width: '100%',