I wouldn't say 99.99%. Goblins archers have it. They don't have the jump but an ability to disengage without taking damage from AOO.
So if trash mobs have a disengage feature, I bet lots of monsters do also have it.
Goblins' whole thing is that they are nimble and good at scampering around. 5e rules give them the ability to disengage: this is not something Larian has added. Almost no other "trash mobs" have this ability.
