Fix bell block entity memory leak

BellBlockEntity has a list of entities (entitiesAtRing) that was not being cleared at the right time, causing leaks whenever a bell would be rung near a crowd of entities.

paper-server/patches/sources/net/minecraft/world/level/block/entity/BellBlockEntity.java.patch

@@ -1,6 +1,26 @@
 --- a/net/minecraft/world/level/block/entity/BellBlockEntity.java
 +++ b/net/minecraft/world/level/block/entity/BellBlockEntity.java
-@@ -120,7 +120,7 @@
+@@ -63,6 +63,11 @@
+ 
+         if (blockEntity.ticks >= 50) {
+             blockEntity.shaking = false;
++            // Paper start - Fix bell block entity memory leak
++            if (!blockEntity.resonating) {
++                blockEntity.nearbyEntities.clear();
++            }
++            // Paper end - Fix bell block entity memory leak
+             blockEntity.ticks = 0;
+         }
+ 
+@@ -76,6 +81,7 @@
+                 ++blockEntity.resonationTicks;
+             } else {
+                 bellEffect.run(world, pos, blockEntity.nearbyEntities);
++                blockEntity.nearbyEntities.clear(); // Paper - Fix bell block entity memory leak
+                 blockEntity.resonating = false;
+             }
+         }
+@@ -120,11 +126,12 @@
                  LivingEntity entityliving = (LivingEntity) iterator.next();
  
                  if (entityliving.isAlive() && !entityliving.isRemoved() && blockposition.closerToCenterThan(entityliving.position(), 32.0D)) {
@@ -9,7 +29,12 @@
                  }
              }
          }
-@@ -144,9 +144,13 @@
+ 
++        this.nearbyEntities.removeIf(e -> !e.isAlive()); // Paper - Fix bell block entity memory leak
+     }
+ 
+     private static boolean areRaidersNearby(BlockPos pos, List<LivingEntity> hearingEntities) {
+@@ -144,9 +151,13 @@
      }
  
      private static void makeRaidersGlow(Level world, BlockPos pos, List<LivingEntity> hearingEntities) {