Disable "List item label" option

Problem/Motivation

The "List item label" facet option doesn't work with the Glossary AZ widget, when you enable it you get this error:

Drupal\facets\Exception\InvalidProcessorException: This field has no datasource, there is no valid use for this processor with this facet in Drupal\facets\Plugin\facets\processor\ListItemProcessor->build() (line 112 of modules/contrib/facets/src/Plugin/facets/processor/ListItemProcessor.php).

Proposed resolution

Hide or disable the "List item label" option.

Remaining tasks

User interface changes

API changes

Data model changes