Bring task execution into server tick timings (#2357)

Spigot-Server-Patches/Server-Tick-Events.patch

@@ -6,7 +6,7 @@ Subject: [PATCH] Server Tick Events
 Fires event at start and end of a server tick
 
 diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
-index c92586ccd..73b8f7f99 100644
+index 7959fba8a8..d72c02680c 100644
 --- a/src/main/java/net/minecraft/server/MinecraftServer.java
 +++ b/src/main/java/net/minecraft/server/MinecraftServer.java
 @@ -0,0 +0,0 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant<TickTas
@@ -18,9 +18,9 @@ index c92586ccd..73b8f7f99 100644
          ++this.ticks;
          this.b(booleansupplier);
 @@ -0,0 +0,0 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant<TickTas
-         this.methodProfiler.exit();
-         org.spigotmc.WatchdogThread.tick(); // Spigot
-         this.slackActivityAccountant.tickEnded(l); // Spigot
+             this.executeAll();
+         }
+         // Paper end
 +        // Paper start
 +        long endTime = System.nanoTime();
 +        long remaining = (TICK_TIME - (endTime - lastTick)) - catchupTime;