As a first step to resolve request DS-4301 (https://github.com/DSpace/DSpace/issues/7641), this pull request defines an endpoint corresponding to the Filtered Collections statistics report I ported from the old DSpace 6 code base.
I integrated the endpoint into the /statistics branch, hence its URI being /api/statistics/filteredcollections.
I also removed repeated items in the list of endpoints in the endpoints.md file.
As a first step to resolve request DS-4301 (https://github.com/DSpace/DSpace/issues/7641), this pull request defines an endpoint corresponding to the Filtered Collections statistics report I ported from the old DSpace 6 code base.
I integrated the endpoint into the /statistics branch, hence its URI being /api/statistics/filteredcollections.
I also removed repeated items in the list of endpoints in the endpoints.md file.