Carved pumpkin drop from shearing a snow golem is hard coded

The carved pumpkin drop from shearing a snow golem is hardcoded. This issue was created due to the fix for MC-267866.

Code Analysis:

Method shear() in SnowGolem
   public void shear(SoundSource soundSource) {
      this.level().playSound((Player)null, this, SoundEvents.SNOW_GOLEM_SHEAR, soundSource, 1.0F, 1.0F);
      if (!this.level().isClientSide()) {
         this.setPumpkin(false);
-> ISSUE START
         this.spawnAtLocation(new ItemStack(Items.CARVED_PUMPKIN), this.getEyeHeight());
-> ISSUE END
      }
   }

Suggested Fix
Introduce a loot table for shearing a snow golem.

Notes

1. The behavior stated here is irregular when compared to the bogged mob, which shearing loot table is entirely customizable, in the 'shearing' directory of the loot tables folder.

2. Related to MC-94610 MC-149589 MC-269838 MC-269839 MC-269873 MC-269874