Revert the taggedCount and postCount

We need the order input types for our admin features.

This is a potential DOS vulnerability: Ordering the tags by taggedCount
might lead to very expensive cypher statements.

backend/src/schema/types/type/Category.gql

@@ -11,6 +11,8 @@ enum _CategoryOrdering {
   createdAt_desc
   updatedAt_asc
   updatedAt_desc
+  postCount_asc
+  postCount_desc
 }
 
 type Category {

backend/src/schema/types/type/Tag.gql

@@ -27,6 +27,10 @@ type Tag {
 enum _TagOrdering {
   id_asc
   id_desc
+  taggedCount_asc
+  taggedCount_desc
+  taggedCountUnique_asc
+  taggedCountUnique_desc
 }
 
 type Query {