Remove "Implement-Chunk-Priority-Urgency-System-for-Chunks" (Fixes #5980)

Mojang made some changes to priorities in 1.17 and it seems that these changes
conflict with the changes made in this patch, which in some cases appears to
cause excessive rescheduling of tasks.

This, however, is not confirmed as such but seems to be the behavior that we're
seeing to cause this issue, if mojang has adopted the changes we suggested,
then a good chunk of this patch may be unneeded, but, this needs a much better
look than I'm currently able to do

patches/server/0507-Add-setMaxPlayers-API.patch

@@ -1,37 +0,0 @@
-From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
-From: Mariell Hoversholm <proximyst@proximyst.com>
-Date: Sat, 22 Aug 2020 23:59:30 +0200
-Subject: [PATCH] Add #setMaxPlayers API
-
-
-diff --git a/src/main/java/net/minecraft/server/players/PlayerList.java b/src/main/java/net/minecraft/server/players/PlayerList.java
-index 13f1b62e6f3adce54f82d6d131dd60976dc6f548..f2b139d565662fca1bbad46e50b5ccb0d08c4e37 100644
---- a/src/main/java/net/minecraft/server/players/PlayerList.java
-+++ b/src/main/java/net/minecraft/server/players/PlayerList.java
-@@ -145,7 +145,7 @@ public abstract class PlayerList {
-     public final PlayerDataStorage playerIo;
-     private boolean doWhiteList;
-     private final RegistryAccess.RegistryHolder registryHolder;
--    protected final int maxPlayers;
-+    protected int maxPlayers; public final void setMaxPlayers(int maxPlayers) { this.maxPlayers = maxPlayers; } // Paper - remove final and add setter
-     private int viewDistance;
-     private boolean allowCheatsForAllPlayers;
-     private static final boolean ALLOW_LOGOUTIVATOR = false;
-diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
-index df20ac811d673c205695d563f84382d1bf1e82e1..c664c4fc1280fd57c3b7e8580294b3823b98eae9 100644
---- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
-+++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
-@@ -621,6 +621,13 @@ public final class CraftServer implements Server {
-         return this.playerList.getMaxPlayers();
-     }
- 
-+    // Paper start
-+    @Override
-+    public void setMaxPlayers(int maxPlayers) {
-+        this.playerList.setMaxPlayers(maxPlayers);
-+    }
-+    // Paper end
-+
-     // NOTE: These are dependent on the corresponding call in MinecraftServer
-     // so if that changes this will need to as well
-     @Override