RawSql.Insert cannot be used as entire Where clause or Set clause in UpdateDataExpression/DeleteDataExpression

[jzabroski]

Describe the bug
RawSql.Insert cannot be used as entire Where clause or Set clause in UpdateDataExpression/DeleteDataExpression

To Reproduce

    [Migration(202406181031, "Testing RawSql.Insert behavior")]
    public class TestMigration : ForwardOnlyMigration
    {
        public override void Up()
        {
            Update.Table("Foo").InSchema("dbo")
                .Set(RawSql.Insert("Baz = CASE WHEN Bar = 1 THEN 2 ELSE 0 END"))
                .Where(RawSql.Insert("Baz IS NULL"));
        }
    }

generates the following invalid SQL expression:

UPDATE [dbo].[Foo] SET [Value] = N'Baz = CASE WHEN Bar = 1 THEN 2 ELSE 0 END' WHERE [Value] = N'Baz IS NULL'

Expected behavior
RawSql should be... raw sql :)

Information (please complete the following information):

• FluentMigrator version 5.2.0

Additional context
Workaround is to use Execute.Sql syntax instead:

    [Migration(202406181031, "Testing RawSql.Insert behavior")]
    public class TestMigration : ForwardOnlyMigration
    {
        public override void Up()
        {
            Execute.Sql(@"UPDATE dbo.Foo
SET Baz = CASE WHEN Bar = 1 THEN 2 ELSE 0 END
WHERE Baz IS NULL");
        }
    }