[MC-192836] NoAI mobs can enter boats and minecarts

Mobs with the NoAI tag can still enter boats if their collision collides with the boat's.

Note: The strange behavior when entering the boat in the video is due to ~~MC-167299~~

Summon a NoAI mob
```
/summon villager ~1 ~ ~2 {NoAI:1}
```
Summon a boat on top of the mob
```
/summon boat ~ ~ ~2
```
Get in the boat. If you do not start slowly moving downwards, get out of the boat and try again. This may take a few attempts.
Get out of the boat. The mob should now be in the boat