OZG-7473 add index.ts entry

Based on CR comment.

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

-import { AggregationMappingListResource } from '@admin-client/reporting-shared';
+import { AggregationMappingListLinkRel, AggregationMappingListResource } from '@admin-client/reporting-shared';
 import { createStateResource, getEmbeddedResources, StateResource } from '@alfa-client/tech-shared';
 import { expectComponentExistsInTemplate, getElementFromFixtureByType } from '@alfa-client/test-utils';
 import { ComponentFixture, TestBed } from '@angular/core/testing';
@@ -6,7 +6,6 @@ import { expect } from '@jest/globals';
 import { SpinnerComponent } from '@ods/component';
 import { ListComponent } from '@ods/system';
 import { MockComponent } from 'ng-mocks';
-import { AggregationMappingListLinkRel } from '../../../../../reporting-shared/src/lib/aggregation-mapping.linkrel';
 import { createAggregationMappingListResource } from '../../../../../reporting-shared/test/aggregation-mapping';
 import { AggregationMappingListItemComponent } from './aggregation-mapping-list-item/aggregation-mapping-list-item.component';
 import { AggregationMappingListComponent } from './aggregation-mapping-list.component';

alfa-client/libs/admin/reporting-shared/src/index.ts

 export * from './lib/aggregation-mapping-list-resource.service';
 export * from './lib/aggregation-mapping-resource.service';
+export * from './lib/aggregation-mapping.linkrel';
 export * from './lib/aggregation-mapping.model';
 export * from './lib/aggregation-mapping.provider';
 export * from './lib/aggregation-mapping.service';

alfa-client/libs/admin/reporting-shared/test/aggregation-mapping.ts

+import { AggregationMappingListLinkRel } from '@admin-client/reporting-shared';
 import { faker } from '@faker-js/faker';
 import { times } from 'lodash-es';
 import { LinkRelationName } from '../../../tech-shared/src';
 import { toResource } from '../../../tech-shared/test/resource';
 import { AggregationMapping, AggregationMappingListResource, AggregationMappingResource } from '../src';
-import { AggregationMappingListLinkRel } from '../src/lib/aggregation-mapping.linkrel';
 
 export function createAggregationMapping(): AggregationMapping {
   return {