Ravagers knockback strength to players blocking with a shield is not affected by changing the attack_knockback attribute to different values

Changing the attack knockback value of Ravagers doesn't change knockback strength applied to players blocking with a shield, despite normal hits dealing knockback proportionally to said value.

This is not the case with hoglins/zoglins, where changing their attack knockback value will deal different knockback strength to players blocking with shields. This issue has been split from MC-235198.

How to reproduce

1. Summon a normal Ravager and block its attack with a shield.

2. Notice how the ravager deals a certain amount of knockback to you.

3. Summon a Ravager with an attack_knockback of 5, do the same again.

   /execute summon minecraft:ravager run attribute @s minecraft:attack_knockback base set 5

4. Notice how the knockback dealt is still the same.

Expected result
Changing the attack knockback attribute of Ravagers would affect their knockback strength applied to players blocking with a shield, like hoglins/zoglins.

Observed result
Ravager knockback strength to players blocking is unaffected by changing their attack knockback to higher or lower values.