Add config to remove player as vehicle restriction in /ride (#12327)

Author: ShaneBeee

paper-server/patches/sources/net/minecraft/server/commands/RideCommand.java.patch

@@ -0,0 +1,11 @@
+--- a/net/minecraft/server/commands/RideCommand.java
++++ b/net/minecraft/server/commands/RideCommand.java
+@@ -58,7 +_,7 @@
+         Entity vehicle1 = target.getVehicle();
+         if (vehicle1 != null) {
+             throw ERROR_ALREADY_RIDING.create(target.getDisplayName(), vehicle1.getDisplayName());
+-        } else if (vehicle.getType() == EntityType.PLAYER) {
++        } else if (vehicle.getType() == EntityType.PLAYER && !io.papermc.paper.configuration.GlobalConfiguration.get().commands.rideCommandAllowPlayerAsVehicle) { // Paper - allow player as vehicle
+             throw ERROR_MOUNTING_PLAYER.create();
+         } else if (target.getSelfAndPassengers().anyMatch(passenger -> passenger == vehicle)) {
+             throw ERROR_MOUNTING_LOOP.create();

paper-server/src/main/java/io/papermc/paper/configuration/GlobalConfiguration.java

@@ -12,7 +12,6 @@
 import net.minecraft.network.protocol.Packet;
 import net.minecraft.network.protocol.game.ServerboundPlaceRecipePacket;
 import net.minecraft.resources.ResourceLocation;
-import net.minecraft.world.item.Items;
 import org.jspecify.annotations.Nullable;
 import org.slf4j.Logger;
 import org.spongepowered.configurate.objectmapping.ConfigSerializable;
@@ -202,6 +201,8 @@ public enum CompressionFormat {
     public class Commands extends ConfigurationPart {
         public boolean suggestPlayerNamesWhenNullTabCompletions = true;
         public boolean timeCommandAffectsAllWorlds = false;
+        @Comment("Allow mounting entities to a player in the Vanilla '/ride' command.")
+        public boolean rideCommandAllowPlayerAsVehicle = false;
     }
 
     public Logging logging;