Redundant arrow: don't report on forEach call with underscore

#KT-27209 Fixed

idea/testData/inspectionsLocal/redundantLambdaArrow/forEach.kt

@@ -0,0 +1,8 @@
+// PROBLEM: none
+// WITH_RUNTIME
+
+fun test() {
+    // We do not report "redundant arrow" here,
+    // because it's used to explicitly call forEach with unused lambda parameter
+    listOf(1, 2, 3).forEach { <caret>_ -> }
+}

idea/testData/inspectionsLocal/redundantLambdaArrow/forEachWithIt.kt

@@ -0,0 +1,7 @@
+// WITH_RUNTIME
+
+fun println(s: String) {}
+
+fun test() {
+    listOf(1, 2, 3).forEach { <caret>it -> println(it) }
+}

idea/testData/inspectionsLocal/redundantLambdaArrow/forEachWithIt.kt.after

@@ -0,0 +1,7 @@
+// WITH_RUNTIME
+
+fun println(s: String) {}
+
+fun test() {
+    listOf(1, 2, 3).forEach { println(it) }
+}