[Design feedback] Re-add animation delay, shade hover actions darker

src/components/datagrid/_data_grid_data_row.scss

@@ -51,17 +51,22 @@
     }
   }
 
-  // On hover, color the cell actions more subdued and show a same-colored focus ring
-  // so the cell actions look less weird on datagrids without cell borders
+  // On hover
   &:hover:not(:focus, :focus-within, .euiDataGridRowCell--open) {
     .euiDataGridRowCell__actions {
-      background-color: $euiBorderColor;
-      border-color: $euiBorderColor;
-      color: $euiColorFullShade;
+      // Delay the actions showing on hover
+      // (Note: the focus ring show instantly on hover & the actions show instantly on focus)
+      animation-delay: $euiAnimSpeedNormal;
+
+      // Color the actions and focus ring grayscale on hover
+      // (Actions look odd without the ring on grids without cell borders)
+      background-color: $euiColorDarkShade;
+      border-color: $euiColorDarkShade;
+      color: $euiColorEmptyShade;
     }
 
     &::after {
-      border-color: $euiBorderColor;
+      border-color: $euiColorDarkShade;
     }
   }