U4-8754 Single content queries like Get(int id) for content, media and members needs to execute a TOP 1 (or LIMIT 1)

updated a bunch of the remaining repositories to also use this pattern where applicable (repos using mappers aren't compatible without more work).

src/Umbraco.Core/Persistence/SqlSyntax/SqlServerSyntaxProvider.cs

@@ -104,6 +104,11 @@ order by T.name, I.name");
             return column.IsIdentity ? GetIdentityString(column) : string.Empty;
         }
 
+        public override Sql SelectTop(Sql sql, int top)
+        {
+            return new Sql(sql.SQL.Insert(sql.SQL.IndexOf(' '), " TOP " + top), sql.Arguments);
+        }
+
         private static string GetIdentityString(ColumnDefinition column)
         {
             return "IDENTITY(1,1)";