Remove wall-time / unused skip tick protection (#11412)

Spigot still maintains some partial implementation of "tick skipping", a
practice in which the MinecraftServer.currentTick field is updated not
by an increment of one per actual tick, but instead set to
System.currentTimeMillis() / 50. This behaviour means that the tracked
tick may "skip" a tick value in case a previous tick took more than the
expected 50ms.

To compensate for this in important paths, spigot/craftbukkit
implements "wall-time". Instead of incrementing/decrementing ticks on
block entities/entities by one for each call to their tick() method,
they instead increment/decrement important values, like
an ItemEntity's age or pickupDelay, by the difference of
`currentTick - lastTick`, where `lastTick` is the value of
`currentTick` during the last tick() call.

These "fixes" however do not play nicely with minecraft's simulation
distance as entities/block entities implementing the above behaviour
would "catch up" their values when moving from a non-ticking chunk to a
ticking one as their `lastTick` value remains stuck on the last tick in
a ticking chunk and hence lead to a large "catch up" once ticked again.

Paper completely removes the "tick skipping" behaviour (See patch
"Further-improve-server-tick-loop"), making the above precautions
completely unnecessary, which also rids paper of the previous described
incompatibility with non-ticking chunks.

patches/server/0088-Configurable-Player-Collision.patch

@@ -18,10 +18,10 @@ index 9a1a961eabd4362c171da78c6be82c867f3696a4..1d0c473442b5c72245c356054440323e
              ComponentSerialization.TRUSTED_STREAM_CODEC.encode(buf, this.playerPrefix);
              ComponentSerialization.TRUSTED_STREAM_CODEC.encode(buf, this.playerSuffix);
 diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
-index a37f11633663e07652274707b29a849e518511c5..6dec7884fdd15eb8f32e8831ed0f3a92af710472 100644
+index 639dd562b7eda25004ea10d6c481173afb214773..30fbbe053ee325f4b9f7722416fb5fb92121e2ad 100644
 --- a/src/main/java/net/minecraft/server/MinecraftServer.java
 +++ b/src/main/java/net/minecraft/server/MinecraftServer.java
-@@ -640,6 +640,20 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
+@@ -639,6 +639,20 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
              this.server.getPluginManager().callEvent(new org.bukkit.event.world.WorldLoadEvent(worldserver.getWorld()));
          }