datatrails: fix: propagate unit to breakdown graphs (#82176)

fix: propagate unit to breakdown graphs

public/app/features/trails/ActionTabs/BreakdownScene.tsx

@@ -196,6 +196,7 @@ export function buildAllLayout(options: Array<SelectableValue<string>>, queryDef
     }
 
     const expr = queryDef.queries[0].expr.replace(VAR_GROUP_BY_EXP, String(option.value));
+    const unit = queryDef.unit;
 
     children.push(
       new SceneCSSGridItem({
@@ -215,6 +216,7 @@ export function buildAllLayout(options: Array<SelectableValue<string>>, queryDef
             })
           )
           .setHeaderActions(new SelectLabelAction({ labelName: String(option.value) }))
+          .setUnit(unit)
           .build(),
       })
     );