Fix world border edge collision (#10053)

The collision shape of the border is determined by flooring the min values and ceiling the max values, so the isCollidingWithBorder() function should mirror such behavior.

patches/server/0719-Collision-optimisations.patch

@@ -105,10 +105,10 @@ index be668387f65a633c6ac497fca632a4767a1bf3a2..e08f4e39db4ee3fed62e37364d17dcc5
  }
 diff --git a/src/main/java/io/papermc/paper/util/CollisionUtil.java b/src/main/java/io/papermc/paper/util/CollisionUtil.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..acd8470b108432ac82e1d2f6efcaabd5540214c2
+index 0000000000000000000000000000000000000000..ee0331a6bc40cdde08d926fd8eb1dc642630c2e5
 --- /dev/null
 +++ b/src/main/java/io/papermc/paper/util/CollisionUtil.java
-@@ -0,0 +1,1850 @@
+@@ -0,0 +1,1851 @@
 +package io.papermc.paper.util;
 +
 +import io.papermc.paper.util.collisions.CachedShapeData;
@@ -1655,11 +1655,12 @@ index 0000000000000000000000000000000000000000..acd8470b108432ac82e1d2f6efcaabd5
 +
 +    public static boolean isCollidingWithBorder(final WorldBorder worldborder, final double boxMinX, final double boxMaxX,
 +                                                final double boxMinZ, final double boxMaxZ) {
-+        final double borderMinX = worldborder.getMinX(); // -X
-+        final double borderMaxX = worldborder.getMaxX(); // +X
++        // border size is rounded like the collide voxel shape of the border
++        final double borderMinX = Math.floor(worldborder.getMinX()); // -X
++        final double borderMaxX = Math.ceil(worldborder.getMaxX()); // +X
 +
-+        final double borderMinZ = worldborder.getMinZ(); // -Z
-+        final double borderMaxZ = worldborder.getMaxZ(); // +Z
++        final double borderMinZ = Math.floor(worldborder.getMinZ()); // -Z
++        final double borderMaxZ = Math.ceil(worldborder.getMaxZ()); // +Z
 +
 +        // inverted check for world border enclosing the specified box expanded by -EPSILON
 +        return (borderMinX - boxMinX) > CollisionUtil.COLLISION_EPSILON || (borderMaxX - boxMaxX) < -CollisionUtil.COLLISION_EPSILON ||