OZG-7473 adjust component/structure; rename db settings -> aggregationMapping

.../aggregation-mapping/aggregation-mapping.e2e.component.ts

.../main-tests/aggregation-mapping/aggregation-mapping.cy.ts

...elper/aggregation-mapping/aggregation-mapping.executor.ts

.../helper/aggregation-mapping/aggregation-mapping.helper.ts

...lper/aggregation-mapping/aggregation-mapping.navigator.ts

...elper/aggregation-mapping/aggregation-mapping.verifier.ts

alfa-client/apps/admin-e2e/src/helper/app.helper.ts

alfa-client/apps/admin-e2e/src/page-objects/main.po.ts

alfa-client/apps/admin-e2e/src/support/cypress-helper.ts