There should be a possibility to delete a single element of custom labels for the `mod-kb-ebsco-java` module.
by using

method with empty `displayLabel` property. Please see the description for this method by following link RM API documentation

To support removal of single custom label element we need to modify ModuleDescriptor with additional endpoint

,
update the corresponding raml file and provide an implementation.
Additional information:
`folio-holdingsiq-client` module already contains methods to communicate with RM API custom labels
Implementation of custom labels backend in mod-kb-ebsco(Ruby) - https://github.com/folio-org/mod-kb-ebsco/pull/86

Acceptance criteria:
Unit and API tests