Add quick fix to remove single lambda parameter if it's unused #KT-14593 Fixed

idea/testData/quickfix/removeSingleLambdaParameter/multiple.kt

@@ -0,0 +1,10 @@
+// "Remove single lambda parameter declaration" "false"
+// ACTION: Move lambda argument into parentheses
+// ACTION: Rename to _
+// ACTION: Specify explicit lambda signature
+// ACTION: Specify type explicitly
+// WITH_RUNTIME
+
+fun main() {
+    mapOf(1 to 2).forEach { t, <caret>u -> println(t) }
+}

idea/testData/quickfix/removeSingleLambdaParameter/simple.kt

@@ -0,0 +1,6 @@
+// "Remove single lambda parameter declaration" "true"
+// WITH_RUNTIME
+
+fun main() {
+    listOf(1).forEach { <caret>x -> println() }
+}

idea/testData/quickfix/removeSingleLambdaParameter/simple.kt.after

@@ -0,0 +1,6 @@
+// "Remove single lambda parameter declaration" "true"
+// WITH_RUNTIME
+
+fun main() {
+    listOf(1).forEach { <caret>println() }
+}