[ES|QL] Small improvements on the warnings/errors (#172782)

## Summary

This is a PR which:

- Corrects the icon shown in warnings (it was displaying the error icon
which is wrong)
<img width="1253" alt="image"
src="4f388edd-734c-4299-9def-841ac6fccba1">

- Makes the icon also clickable (opens the popover with the list of
warnings/errors)

Co-authored-by: Marco Liberati <dej611@users.noreply.github.com>

packages/kbn-text-based-editor/src/editor_footer.tsx

@@ -109,7 +109,14 @@ export function ErrorsWarningsPopover({
     <EuiFlexItem grow={false}>
       <EuiFlexGroup gutterSize="xs" responsive={false} alignItems="center">
         <EuiFlexItem grow={false}>
-          <EuiIcon type="error" color={strings.color} size="s" />
+          <EuiIcon
+            type={type}
+            color={strings.color}
+            size="s"
+            onClick={() => {
+              setIsPopoverOpen(!isPopoverOpen);
+            }}
+          />
         </EuiFlexItem>
         <EuiFlexItem grow={false}>
           <EuiPopover