Introduce Variable: Proper occurrence search in generated block expression

#KT-7836 Fixed
 #KT-8443 Fixed
 #EA-71411 Fixed

idea/testData/refactoring/introduceVariable/IntroduceLambdaAndCreateBlock.kt

@@ -0,0 +1,5 @@
+// WITH_RUNTIME
+
+fun foo(p: Int, list: List<Int>) {
+    if (p > 0) list.filter <selection>{ it > 0 }</selection>
+}