Piglins should avoid Nether Portals

Piglins should avoid Nether Portals just like they avoid soul fire.

The reason for this is because Hoglins avoid Nether Portals, presumably because they somehow know that going through one will turn them into a Zoglin. Piglins also zombify when leaving the Nether, and they're much more intelligent than Hoglins, so they should know that Nether Portals are dangerous for them and avoid them.