MDEV-31003: Second execution for ps-protocol

This patch adds for "--ps-protocol" second execution
of queries "SELECT".
Also in this patch it is added ability to disable/enable
(--disable_ps2_protocol/--enable_ps2_protocol) second
execution for "--ps-prototocol" in testcases.

mysql-test/suite/plugins/t/qc_info.test

@@ -4,8 +4,10 @@ set @save_query_cache_size=@@global.query_cache_size;
 
 # test that hits are correctly incremented
 reset query cache;
+--disable_ps2_protocol
 select * from t1;
 select * from t1;
+--enable_ps2_protocol
 select hits, statement_text from information_schema.query_cache_info;
 
 drop table t1;