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

jps-plugin/testData/incremental/custom/javaConstantUnchangedUsedInKotlin/JavaClass.java.new

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

jps-plugin/testData/incremental/custom/kotlinConstantUnchangedUsedInJava/const.kt.new

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

jps-plugin/testData/incremental/custom/projectPathCaseChanged/foo.kt.new

@@ -1,2 +0,0 @@
-fun f() {
-}

jps-plugin/testData/incremental/custom/projectPathCaseChangedMultiFile/foo.kt.new

@@ -1,2 +0,0 @@
-fun foo() {
-}