[Discover] Fix beta badge alignment (#146267)

## Summary

Closes #144655

[a-la-karte environment to
test](https://dimaanj-pr-146267-fix-beta-badge.kbndev.co/etr/app/discover#/?_g=(filters:!(),refreshInterval:(pause:!t,value:0),time:(from:now-15m,to:now))&_a=(columns:!(),filters:!(),index:ff959d40-b880-11e8-a6d9-e546fe2bba5f,interval:auto,query:(language:kuery,query:''),sort:!(!(order_date,desc))))

src/plugins/discover/public/components/view_mode_toggle/view_mode_toggle.tsx

@@ -41,6 +41,10 @@ export const DocumentViewModeToggle = ({
     margin-left: ${useEuiPaddingSize('s')};
   `;
 
+  const betaBadgeCss = css`
+    vertical-align: middle;
+  `;
+
   const showViewModeToggle = uiSettings.get(SHOW_FIELD_STATISTICS) ?? false;
 
   if (!showViewModeToggle) {
@@ -77,6 +81,7 @@ export const DocumentViewModeToggle = ({
               })}
               size="s"
               className="fieldStatsBetaBadge"
+              css={betaBadgeCss}
             />
           </EuiFlexItem>
         </EuiFlexGroup>