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

jps-plugin/testData/incremental/pureKotlin/packageInlineFunctionAccessingField/usage.kt.new

@@ -1,6 +0,0 @@
-package test
-
-fun main(args: Array<String>) {
-    f { println("to be inlined") }
-    other.f { println("to be inlined") }
-}