[MC-199788] Boat on entity creates ice effect

When you're riding a boat on top of another entity, the boat moves as if on water and slides as if on ice.

Linked issues

migrated 2020-09-08T10:40:38Z

Can confirm for 1.16.3-rc1

bemoty 2020-09-08T13:18:32Z

Confirmed for 1.16.3 RC1

Avoma 2020-11-23T16:41:24Z

I can confirm for 20w46a.

Avoma 2021-01-17T15:31:28Z

Can confirm in 20w51a.

Avoma 2021-01-29T10:31:08Z

Can confirm in 21w03a.

Avoma 2021-04-09T16:03:08Z

Can confirm in 21w14a.