Minor: use ".touch" extension instead of ".new" in incremental compilation tests when it possible

jps-plugin/testData/incremental/withJava/javaUsedInKotlin/constantUnchanged/JavaClass.java.new

@@ -1,3 +0,0 @@
-public class JavaClass {
-    public static final String CONST = "A";
-}

jps-plugin/testData/incremental/withJava/javaUsedInKotlin/notChangeSignature/JavaClass.java.new

@@ -1,4 +0,0 @@
-public class JavaClass {
-    public static void foo() {
-    }
-}

jps-plugin/testData/incremental/withJava/kotlinUsedInJava/constantUnchanged/const.kt.new

@@ -1,7 +0,0 @@
-package test
-
-class Klass {
-    companion object {
-        val CONST = "bar"
-    }
-}

jps-plugin/testData/incremental/withJava/kotlinUsedInJava/notChangeSignature/fun.kt.new

@@ -1,5 +0,0 @@
-package test
-
-fun foo() {
-
-}