Players can cure Bad Omen with milk

See summary. It should be impossible for a player to get rid of a possible surprise raid just by drinking milk.

How to reproduce:

1. Give yourself milk
2. Perform "/effect give @s bad_omen"
3. Drink the milk
    → You no longer have a bad omen

This is probably unintended, because the developers wanted the player to keep their reputation among pillagers for killing their leader until he or she dies.

A possible way to fix this is to make bad omens player/mob attributes, rather than status effects.