fix: [Platform:StackManagement:Kibana:Spaces] Information about saved objects in content rows is not announced (#218438)

Closes: #218362

**Description**
When user tabs through content rows on content tab, the information
about saved objects in the content row is announced as "link 1, link2"
which doesn't give any context to non-sighted user.

**Changes made:**
1. Set `aria-label` for mentioned place

# Screen

<img width="1063" alt="image"
src="https://github.com/user-attachments/assets/452885c2-9738-4d17-84c9-3033250c6841"
/>

x-pack/platform/plugins/shared/spaces/public/management/edit_space/edit_space_content_tab.tsx

@@ -61,7 +61,24 @@ export const EditSpaceContentTab: FC<{ space: Space }> = ({ space }) => {
           space.id,
           `${ENTER_SPACE_PATH}?next=${uriComponent}`
         );
-        return <EuiLink href={href}>{value}</EuiLink>;
+        return (
+          <EuiLink
+            href={href}
+            aria-label={i18n.translate(
+              'xpack.spaces.management.editSpaceContent.countLinkAriaLabel',
+              {
+                defaultMessage:
+                  'Discover {count} {count, plural, one {item} other {items}} in {name}',
+                values: {
+                  name: item.displayName,
+                  count: item.count,
+                },
+              }
+            )}
+          >
+            {value}
+          </EuiLink>
+        );
       },
     },
   ];