Allow selection of all paragrahs displays for paragraphs slider behavior

First MR ready, took a shortcut:

        // TODO - return displays of only target paragraph bundles.
        // For now just return all paragraph displays until we improve this.
        if ($field_definition instanceof FieldConfig && $field_definition->getType() == 'entity_reference_revisions') {
          $displays = $this->entityDisplayRepository->getViewModeOptions('paragraph');
          break;
        }

This is more then enough for now to test this. We can improve it later ;) And seems it is working fine.