Fix premature player kicks on shutdown

When the server is stopping, the default execution handler method will throw a
RejectedExecutionException in order to prevent further execution, this causes
us to lose the actual kick reason. To mitigate this, we'll use a seperate marked
class in order to gracefully ignore these.

paper-server/patches/sources/net/minecraft/server/MinecraftServer.java.patch

@@ -1232,6 +1232,15 @@
      }
  
      public boolean isReady() {
+@@ -1593,7 +2127,7 @@
+     @Override
+     public void executeIfPossible(Runnable runnable) {
+         if (this.isStopped()) {
+-            throw new RejectedExecutionException("Server already shutting down");
++            throw new io.papermc.paper.util.ServerStopRejectedExecutionException("Server already shutting down"); // Paper - do not prematurely disconnect players on stop
+         } else {
+             super.executeIfPossible(runnable);
+         }
 @@ -1632,13 +2166,19 @@
          return this.functionManager;
      }
@@ -1312,22 +1321,19 @@
  
                      try {
                          arraylist = Lists.newArrayList(NativeModuleLister.listModules());
-@@ -2105,9 +2650,24 @@
-         if (bufferedwriter != null) {
-             bufferedwriter.close();
-         }
-+
-+    }
-+
+@@ -2108,6 +2653,21 @@
+ 
+     }
+ 
 +    // CraftBukkit start
 +    public boolean isDebugging() {
 +        return false;
 +    }
- 
++
 +    public static MinecraftServer getServer() {
 +        return SERVER; // Paper
-     }
- 
++    }
++
 +    @Deprecated
 +    public static RegistryAccess getDefaultRegistryAccess() {
 +        return CraftRegistry.getMinecraftRegistry();
@@ -1366,11 +1372,13 @@
      }
  
      public boolean logIPs() {
-@@ -2379,4 +2945,30 @@
-     public static record ServerResourcePackInfo(UUID id, String url, String hash, boolean isRequired, @Nullable Component prompt) {
- 
+@@ -2377,6 +2943,32 @@
      }
+ 
+     public static record ServerResourcePackInfo(UUID id, String url, String hash, boolean isRequired, @Nullable Component prompt) {
 +
++    }
+ 
 +    // Paper start - Add tick times API and /mspt command
 +    public static class TickTimes {
 +        private final long[] times;
@@ -1394,6 +1402,6 @@
 +            }
 +            return ((double) total / (double) times.length) * 1.0E-6D;
 +        }
-+    }
+     }
 +    // Paper end - Add tick times API and /mspt command
  }