Filters out groups from being returned from an aggregation.
The having() function refines a WixDataAggregate so that it only
includes groups from the aggregate's grouping which match the specified
filter criteria.
To create a filter, use the wix-data filter() function.
Filtering using having() takes place after grouping is performed on the
aggregation. To filter items before grouping, use the filter() function.
Note: Aggregations can only be used on collections you have created. They cannot be used on Wix App Collections.
The filter to use to filter out groups from being returned from the aggregation.