Don't read neighbour chunk data off disk when converting chunks

Lighting is purged on update anyways, so let's not add more
into the conversion process

paper-server/patches/sources/net/minecraft/world/level/chunk/storage/ChunkStorage.java.patch

@@ -18,7 +18,7 @@
  import net.minecraft.world.level.levelgen.structure.LegacyStructureDataHandler;
  import net.minecraft.world.level.storage.DimensionDataStorage;
  
-@@ -39,27 +45,85 @@
+@@ -39,27 +45,86 @@
          return this.worker.isOldChunkAround(chunkPos, checkRadius);
      }
  
@@ -26,6 +26,7 @@
 -        int i = ChunkStorage.getVersion(nbt);
 +    // CraftBukkit start
 +    private boolean check(ServerChunkCache cps, int x, int z) {
++        if (true) return true; // Paper - Perf: this isn't even needed anymore, light is purged updating to 1.14+, why are we holding up the conversion process reading chunk data off disk - return true, we need to set light populated to true so the converter recognizes the chunk as being "full"
 +        ChunkPos pos = new ChunkPos(x, z);
 +        if (cps != null) {
 +            com.google.common.base.Preconditions.checkState(org.bukkit.Bukkit.isPrimaryThread(), "primary thread");
@@ -116,7 +117,7 @@
              } catch (Exception exception) {
                  CrashReport crashreport = CrashReport.forThrowable(exception, "Updated chunk");
                  CrashReportCategory crashreportsystemdetails = crashreport.addCategory("Updated chunk details");
-@@ -70,7 +134,7 @@
+@@ -70,7 +135,7 @@
          }
      }
  
@@ -125,7 +126,7 @@
          LegacyStructureDataHandler persistentstructurelegacy = this.legacyStructureHandler;
  
          if (persistentstructurelegacy == null) {
-@@ -85,7 +149,7 @@
+@@ -85,7 +150,7 @@
          return persistentstructurelegacy;
      }
  
@@ -134,7 +135,7 @@
          CompoundTag nbttagcompound1 = new CompoundTag();
  
          nbttagcompound1.putString("dimension", worldKey.location().toString());
-@@ -108,8 +172,19 @@
+@@ -108,8 +173,19 @@
      }
  
      public CompletableFuture<Void> write(ChunkPos chunkPos, Supplier<CompoundTag> nbtSupplier) {