OZG-5708: improve code after code review

alfa-client/libs/bescheid-shared/src/lib/bescheid.service.ts

alfa-client/libs/command-shared/test/command.ts

.../design-system/src/lib/attachment/attachment.component.ts

alfa-client/libs/tech-shared/src/index.ts

...ng-detail-bescheiden-result-attachments.component.spec.ts

.../vorgang-detail-bescheiden-result-dokument.component.html

...rgang-detail-bescheiden-result-dokument.component.spec.ts

...nt/vorgang-detail-bescheiden-result-dokument.component.ts