fix: "num components" not updated when a component in a collection is…

… discarded

The error occurs because even if the changes are discarded,
the unpublished entities remain within the collections,
so all unpublished entities must be removed from the collections.

openedx/core/djangoapps/content_libraries/api.py

@@ -1352,6 +1352,11 @@ def revert_changes(library_key):
     learning_package = ContentLibrary.objects.get_by_key(library_key).learning_package
     authoring_api.reset_drafts_to_published(learning_package.id)
 
+    # If a component is created within a collection and then returned to the published
+    # version, that component must be removed from the collection.
+    # All collections in the library are checked.
+    authoring_api.remove_unpublished_from_collections(learning_package.id)
+
     CONTENT_LIBRARY_UPDATED.send_event(
         content_library=ContentLibraryData(
             library_key=library_key,