Add test case for renaming a column and only applying inserts

This catches a bug in `sql.BuildDMLInsertQuery` where we we are fetching
the insert values using the renamed column's name, and end up fetching
the value of the wrong column.

The test in `localtests/rename` did not catch this because binlog
update events were "correcting" the error, as they follow a different
code path that does not contain the bug.

localtests/rename-inserts-only/create.sql

@@ -0,0 +1,22 @@
+drop table if exists gh_ost_test;
+create table gh_ost_test (
+  id int auto_increment,
+  c1 int not null,
+  c2 int not null,
+  primary key (id)
+) auto_increment=1;
+
+drop event if exists gh_ost_test;
+delimiter ;;
+create event gh_ost_test
+  on schedule every 1 second
+  starts current_timestamp
+  ends current_timestamp + interval 60 second
+  on completion not preserve
+  enable
+  do
+begin
+  insert into gh_ost_test values (null, 11, 23);
+  insert into gh_ost_test values (null, 13, 23);
+  insert into gh_ost_test values (null, rand(), rand());
+end ;;

localtests/rename-inserts-only/extra_args

@@ -0,0 +1 @@
+--alter="change column c2 c3 int not null" --approve-renamed-columns