`MySqlBulkCopy` can't load column that starts with `@`

[bgrainger]

using (var cmd = new MySqlCommand("""
	drop table if exists test;
	create table test(`@a` int);
	insert into test values(1);
	""", conn))
	cmd.ExecuteNonQuery();
	
var bulkCopy = new MySqlBulkCopy(conn)
{
	DestinationTableName = "test",
};

var dataTable = new DataTable();
dataTable.Columns.Add(new DataColumn() { DataType = typeof(int) });
dataTable.Rows.Add(new object[] { 2 });

bulkCopy.WriteToServer(dataTable);

using (var cmd = new MySqlCommand("select * from test;", conn))
using (var reader = cmd.ExecuteReader())
{
	while (reader.Read())
		Console.WriteLine($"{reader.IsDBNull(0)} {reader.GetValue(0)}"); // second row is NULL
}

The leading @ in the column name is detected as a variable; it should be quoted as an identifier instead.

Related to https://github.com/mysql-net/MySqlConnector/security/code-scanning/3.