Redundant lambda arrow: do not report on nested lambda

#KT-29093 Fixed

idea/testData/inspectionsLocal/redundantLambdaArrow/nestedLambda.kt

@@ -0,0 +1,7 @@
+// PROBLEM: none
+// WITH_RUNTIME
+fun test() {
+    listOf("A").forEach {
+        setOf(1).map { <caret>_ -> it.length }
+    }
+}

idea/testData/inspectionsLocal/redundantLambdaArrow/nestedLambda2.kt

@@ -0,0 +1,9 @@
+// PROBLEM: none
+// WITH_RUNTIME
+fun test() {
+    listOf("A").forEach {
+        listOf("B").forEach { _ ->
+            setOf(1).map { <caret>_ -> it.length }
+        }
+    }
+}

idea/testData/inspectionsLocal/redundantLambdaArrow/nestedLambda3.kt

@@ -0,0 +1,9 @@
+// WITH_RUNTIME
+fun test() {
+    listOf("A").forEach {
+        setOf(1).map { <caret>_ ->
+            val it = "B"
+            it.length
+        }
+    }
+}

idea/testData/inspectionsLocal/redundantLambdaArrow/nestedLambda3.kt.after

@@ -0,0 +1,9 @@
+// WITH_RUNTIME
+fun test() {
+    listOf("A").forEach {
+        setOf(1).map {
+            val it = "B"
+            it.length
+        }
+    }
+}