OZG-5977 add multi file upload to bescheid wizard

Sub task: OZG-7783

alfa-client/libs/bescheid/src/lib/bescheid-wizard-container/bescheid-wizard/attachment-files-container/attachment-files/bescheid-wizard-attachment-files.component.html

-<ods-attachment-wrapper>
-  @for (attachment of attachments; track $index) {
-    <alfa-binary-file2-container
-      [file]="attachment"
-      [deletable]="deletable"
-      (startDelete)="delete.emit($event)"
-      [attr.data-test-id]="(attachment.name | convertForDataTest) + '-file2-container'"
-    >
-    </alfa-binary-file2-container>
-  }
-  @if (upload.loading || upload.error) {
-    <ods-attachment
-      [loadingCaption]="upload.fileName"
-      errorCaption="Fehler beim Hochladen"
-      [errorMessages]="upload.error | convertProblemDetailToErrorMessages"
-      description="Anhang wird hochgeladen"
-      [isLoading]="upload.loading"
-      data-test-id="attachment-upload-in-progress"
-    ></ods-attachment>
-  }
-</ods-attachment-wrapper>