OZG-7473 add type

Based on CR comment.

alfa-client/libs/admin/aggregation-mapping/src/lib/aggregation-mapping-list-container/aggregation-mapping-list-container.component.spec.ts

@@ -109,7 +109,7 @@ describe('AggregationMappingListContainerComponent', () => {
         component.listStateResource$ = of(stateResource);
         fixture.detectChanges();
 
-        const comp = getElementFromFixtureByType(fixture, AggregationMappingListComponent);
+        const comp: AggregationMappingListComponent = getElementFromFixtureByType(fixture, AggregationMappingListComponent);
 
         expect(comp.aggregationMappingListStateResource).toEqual(stateResource);
       });