Iterate Intention: Fix detection of extension iterators

#KT-8616 Fixed

idea/testData/intentions/iterateExpression/extensionIterator.kt

@@ -0,0 +1,8 @@
+// WITH_RUNTIME
+class T<U>
+
+operator fun <U> T<U>.iterator(): Iterator<U> = listOf<U>().iterator()
+
+fun test() {
+    T<Int>()<caret>
+}

idea/testData/intentions/iterateExpression/extensionIterator.kt.after

@@ -0,0 +1,10 @@
+// WITH_RUNTIME
+class T<U>
+
+operator fun <U> T<U>.iterator(): Iterator<U> = listOf<U>().iterator()
+
+fun test() {
+    for (i in T<Int>()) {
+        <caret>
+    }
+}

idea/testData/intentions/iterateExpression/extensionIteratorWithPartialSubstitution1.kt

@@ -0,0 +1,8 @@
+// WITH_RUNTIME
+class T<U, V>
+
+operator fun <X> T<X, String>.iterator(): Iterator<X> = listOf<X>().iterator()
+
+fun test() {
+    T<Int, String>()<caret>
+}

idea/testData/intentions/iterateExpression/extensionIteratorWithPartialSubstitution1.kt.after

@@ -0,0 +1,10 @@
+// WITH_RUNTIME
+class T<U, V>
+
+operator fun <X> T<X, String>.iterator(): Iterator<X> = listOf<X>().iterator()
+
+fun test() {
+    for (i in T<Int, String>()) {
+        <caret>
+    }
+}

idea/testData/intentions/iterateExpression/extensionIteratorWithPartialSubstitution2.kt

@@ -0,0 +1,9 @@
+// WITH_RUNTIME
+// IS_APPLICABLE: false
+class T<U, V>
+
+operator fun <X> T<X, String>.iterator(): Iterator<X> = listOf<X>().iterator()
+
+fun test() {
+    T<Int, Boolean>()<caret>
+}

idea/testData/intentions/iterateExpression/mapIterator.kt

@@ -0,0 +1,4 @@
+// WITH_RUNTIME
+fun test() {
+    mapOf(1 to "1", 2 to "2")<caret>
+}

idea/testData/intentions/iterateExpression/mapIterator.kt.after

@@ -0,0 +1,6 @@
+// WITH_RUNTIME
+fun test() {
+    for (entry in mapOf(1 to "1", 2 to "2")) {
+        <caret>
+    }
+}