Add FULLTEXT operator for multivalued fields in page provider predicate editor

As found out by Herbert Vielhaber , using FULLTEXT operator for multivalued fields in page provider predicate is working. It should be available in the predicate editor as for now, one has to uncheck "multi-valued" on the field and then re-set it as a workaround.

see https://nuxeo.slack.com/archives/C03492258/p1715632983585509

Note: we should add the ElasticSearchFeature on TestSearchOperatorsCompatibility class and test the expected behavior for all types of multivalued fields