alter_copy_bulk fix

Related to FIXME here. Now check_bulk_buffer() returns false.

3389                    if (auto t= trx->check_bulk_buffer(index->table)) {
3390                            /* MDEV-25036 FIXME:
3391                            row_ins_check_foreign_constraint() check
3392                            should be done before buffering the insert
3393                            operation. */
3394                            ut_ad(index->table->skip_alter_undo
3395                                  || !trx->check_foreigns);
3396                            return t->bulk_insert_buffered(*entry, *index, trx);
3397                    }

mysql-test/suite/innodb/r/alter_copy_bulk.result

@@ -45,6 +45,5 @@ ALTER TABLE t1 ALGORITHM=COPY, FORCE;
 affected rows: 2
 info: Records: 2  Duplicates: 0  Warnings: 0
 ALTER TABLE t2 ALGORITHM=COPY, FORCE;
-affected rows: 1
-info: Records: 1  Duplicates: 0  Warnings: 0
+ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`#sql-alter`, CONSTRAINT `)
 DROP TABLE t2, t1;

mysql-test/suite/innodb/t/alter_copy_bulk.test

@@ -63,6 +63,8 @@ INSERT INTO t1 VALUES(3, 1);
 SET STATEMENT foreign_key_checks=0 FOR
 ALTER TABLE t2 ALGORITHM=COPY, ADD CONSTRAINT FOREIGN KEY(f2) REFERENCES t1(f1);
 ALTER TABLE t1 ALGORITHM=COPY, FORCE;
+--replace_regex /#sql-alter-[0-9a-f-]*/#sql-alter/
+--error ER_NO_REFERENCED_ROW_2
 ALTER TABLE t2 ALGORITHM=COPY, FORCE;
 --disable_info
 DROP TABLE t2, t1;