Online DDL/VReplication: add PK DATETIME->TIMESTAMP test

go/test/endtoend/onlineddl/vrepl_suite/testdata/datetime-to-timestamp-pk/alter

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+change column t t timestamp default current_timestamp

go/test/endtoend/onlineddl/vrepl_suite/testdata/datetime-to-timestamp-pk/create.sql

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+drop table if exists onlineddl_test;
+create table onlineddl_test (
+  id int unsigned auto_increment,
+  i int not null,
+  ts0 timestamp default current_timestamp,
+  ts1 timestamp null,
+  dt2 datetime,
+  t   datetime default current_timestamp,
+  updated tinyint unsigned default 0,
+  primary key(id, t),
+  key i_idx(i)
+) auto_increment=1;
+
+drop event if exists onlineddl_test;
+delimiter ;;
+create event onlineddl_test
+  on schedule every 1 second
+  starts current_timestamp
+  ends current_timestamp + interval 60 second
+  on completion not preserve
+  enable
+  do
+begin
+  insert into onlineddl_test values (null, 7, null, now(), now(), '2010-10-20 10:20:30', 0);
+
+  insert into onlineddl_test values (null, 11, null, now(), now(), '2010-10-20 10:20:30', 0);
+  update onlineddl_test set dt2=now() + interval 1 minute, updated = 1 where i = 11 order by id desc limit 1;
+
+  insert into onlineddl_test values (null, 13, null, now(), now(), '2010-10-20 10:20:30', 0);
+  update onlineddl_test set t=t + interval 1 minute, updated = 1 where i = 13 order by id desc limit 1;
+end ;;

go/test/endtoend/onlineddl/vrepl_suite/testdata/datetime-to-timestamp-pk/ignore_versions

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+(5.5)