MDEV-26146: The test main.limit_rows_examined fails in case it is run in PS mode.

Test failed by firing assert in append_warnings() when it is called
from run_query_stmt() and there are more results from server.

Obviously, append_warnings() should be called after the last packet
received from server. So, to fix the assertion failure the function
mysql_more_results() has to be called to check that now more results
does exist and invokes append_warnings() in case the condition satisfied.

client/mysqltest.cc

@@ -8416,7 +8416,7 @@ void run_query_stmt(struct st_connection *cn, struct st_command *command,
         append_session_track_info(ds, mysql);
 
 
-      if (!disable_warnings)
+      if (!disable_warnings && !mysql_more_results(stmt->mysql))
       {
         /* Get the warnings from execute */
 

mysql-test/main/limit_rows_examined.test

@@ -2,11 +2,6 @@
 # Tests for LIMIT ROWS EXAMINED, MDEV-28
 #
 
-if (`SELECT $PS_PROTOCOL != 0`)
-{
-   --skip Test temporarily disabled for ps-protocol
-}
-
 --source include/default_optimizer_switch.inc
 call mtr.add_suppression("Sort aborted.*");