ER_SLAVE_SKIP_NOT_IN_GTID only emits if @@sql_slave_skip_counter is set last

As of 06b2e327fc, changing @@sql_slave_skip_counter raises ER_SLAVE_SKIP_NOT_IN_GTID error when all of these replication mode are set:

• GTID
• multi-domain (@@GLOBAL.gtid_slave_pos has entries of different Domain IDs)
• parallel (@@GLOBAL.slave_parallel_threads > 1)

But the only instance of ER_SLAVE_SKIP_NOT_IN_GTID is in SET @@sql_slave_skip_counter's code - this error can be bypassed (does not emit) as long as @@sql_slave_skip_counter is not set after meeting the criteria:

SET @@GLOBAL.sql_slave_skip_counter= 5;

SET @@GLOBAL.slave_parallel_threads= 5;

SET @@GLOBAL.gtid_slave_pos= '1-1-1,2-1-1';

CHANGE MASTER TO master_use_gtid= SLAVE_POS; -- no error

SET @@GLOBAL.gtid_slave_pos= '1-1-1,2-1-1';  -- no error

SET @@GLOBAL.slave_parallel_threads= 5;      -- no error

SET @@GLOBAL.sql_slave_skip_counter= 5;      -- ER_SLAVE_SKIP_NOT_IN_GTID