Fix pointer events behavior on notification indicator on SplitButton (elastic#245318)

## Summary

This PR fixes an issue where the indicator wrapper would prevent the
underlying button from being fully clickable. This fix still allows for
tooltip to work when hovering over the dot icon.

Author: kowalczyk-krzysztof

src/platform/packages/private/kbn-split-button/src/split_button_with_notification.tsx

@@ -66,6 +66,7 @@ export const SplitButtonWithNotification = ({
             left: notificationIndicatorPosition?.left,
             bottom: notificationIndicatorPosition?.bottom,
             zIndex: 1,
+            pointerEvents: 'none',
             ...(notificationIndicatorHasStroke && {
               '& svg': {
                 stroke: 'white',
@@ -75,12 +76,14 @@ export const SplitButtonWithNotification = ({
             }),
           }}
         >
-          <EuiIconTip
-            type="dot"
-            size={notificationIndicatorSize}
-            color={notificationIndicatorColor}
-            content={notifcationIndicatorTooltipContent}
-          />
+          <span css={{ pointerEvents: 'auto' }}>
+            <EuiIconTip
+              type="dot"
+              size={notificationIndicatorSize}
+              color={notificationIndicatorColor}
+              content={notifcationIndicatorTooltipContent}
+            />
+          </span>
         </div>
       )}
     </div>