Prevent fetching ML data when ML popover is opened/closed

We already fetch this data when the component is initially rendered. In
the normal workflow of page load -> open popover, we perform six (6) ML
API calls, 3 of which are redundant.

The one downside of this is that opening/closing the popover will not
refresh data; however, this workflow would previously have resulted in 6
API calls as well.

x-pack/plugins/security_solution/public/common/components/ml_popover/ml_popover.tsx

@@ -144,7 +144,6 @@ export const MlPopover = React.memo(() => {
             iconSide="right"
             onClick={() => {
               setIsPopoverOpen(!isPopoverOpen);
-              dispatch({ type: 'refresh' });
             }}
           >
             {i18n.ML_JOB_SETTINGS}