Add aliases for closest to nearest entity expression (#8226)

Author: CJH3139

src/main/java/ch/njol/skript/expressions/ExprNearestEntity.java

@@ -37,8 +37,8 @@ public class ExprNearestEntity extends SimpleExpression<Entity> {
 
 	static {
 		Skript.registerExpression(ExprNearestEntity.class, Entity.class, ExpressionType.COMBINED,
-				"[the] nearest %*entitydatas% [[relative] to %entity/location%]",
-				"[the] %*entitydatas% nearest [to %entity/location%]");
+				"[the] (nearest|closest) %*entitydatas% [[relative] to %entity/location%]",
+				"[the] %*entitydatas% (nearest|closest) [to %entity/location%]");
 	}
 
 	@SuppressWarnings("NotNullFieldNotInitialized")

src/test/skript/tests/syntaxes/expressions/ExprNearestEntity.sk

@@ -1,5 +1,6 @@
 test "nearest entity does not allow duplicate entities":
 	assert nearest cow and cow relative to {_null} to fail with "duplicate entities were allowed in nearest entity expr"
+	assert closest cow and cow relative to {_null} to fail with "duplicate entities were allowed in nearest entity expr"
 
 # server doesn't spawn the entities until the next tick, and we can't wait in the test system so... commented for now
 #test "nearest entity":