Mace smash attack knockback can affect armor stands

Preforming a mace smash attack will cause nearby armor stands to recieve knockback.

Steps to Reproduce:

1. Place down two armor stands next to eachother
2. Hold a mace
3. Teleport the player 10 blocks into the air

   /tp @p ~ ~10 ~
   

4. Smash attack one of the armor stands

Expected & Observed Results:

- The nearby armor stand takes knockback
- The nearby armor stand would not take knockback, as armor stands are not supposed to receive knockback from player attacks.

Screenshots/Videos:

ArmorStandMaceSmash.mp4

Notes:

Relates closely to MC-268025 MC-175132