[MC-205797] Zoglins attack Marker armor stands and Invisible armor stands

The bug

As ~~MC-177122~~ was resolved as WAI, zoglins seem to attack all kinds of armor stands. This includes marker and invisible armor stands. It can mess with mapmakers, as they commonly use armor stands, and making zoglins attack something that doesn't exist kind of ruins the experience.

Maybe armor stands should get an optional tag (AttackedByZoglins) which can be set to true or false (true by default as ~~MC-177122~~ was resolved as WAI)

How to reproduce

/summon minecraft:armor_stand ~ ~ ~ {Marker:1b}

```
/summon minecraft:zoglin
```

Please note that it only applies to armor stands with a Marker tag, and not the new Marker entity!