Fix combine extract column drill icons (#42297)

* Use extract column icon for column extraction drill thru

* Use combine column icon for column combine drill thru

frontend/src/metabase/querying/utils/drills/column-extract-drill/column-extract-drill.tsx

@@ -57,7 +57,7 @@ export const columnExtractDrill: Drill<Lib.ColumnExtractDrillThruInfo> = ({
       name: "extract",
       title: drillInfo.displayName,
       section: "extract",
-      icon: "extract",
+      icon: "arrow_split",
       buttonType: "horizontal",
       popover: DrillPopover,
     },

frontend/src/metabase/querying/utils/drills/combine-columns-drill/combine-columns-drill.tsx

@@ -45,7 +45,7 @@ export const combineColumnsDrill: Drill<Lib.CombineColumnsDrillThruInfo> = ({
       name: "combine",
       title: t`Combine columns`,
       section: "combine",
-      icon: "add",
+      icon: "combine",
       buttonType: "horizontal",
       popover: DrillPopover,
     },