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

Original commit: d9b67ae0ef

jps/jps-plugin/testData/incremental/lazyKotlinCaches/class/A.kt.new

@@ -1 +0,0 @@
-public class A

jps/jps-plugin/testData/incremental/lazyKotlinCaches/function/utils.kt.new

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

jps/jps-plugin/testData/incremental/lazyKotlinCaches/inlineFunctionWithoutUsage/inline.kt.new

@@ -1,3 +0,0 @@
-package inline
-
-inline fun f() {}

jps/jps-plugin/testData/incremental/lazyKotlinCaches/noKotlin/A.java.new

@@ -1,2 +0,0 @@
-public class A {
-}