Add tests for enhanced java signatures based on AbstractResolvedCallsTest.

Refactor AbstractResolvedCallsTest to support multiple carets (multiple methods being tested  for resolve) in testdata file.

compiler/testData/resolvedCalls/enhancedSignatures/iterator/iteratorForEachRemaining.kt

@@ -0,0 +1,7 @@
+fun notNullValues(it: Iterator<String>) {
+    it.<caret>forEachRemaining { e -> }
+}
+
+fun mutableNullableValues(it: MutableIterator<String?>) {
+    it.<caret>forEachRemaining { e -> }
+}

compiler/testData/resolvedCalls/enhancedSignatures/iterator/iteratorForEachRemaining.txt

@@ -0,0 +1,13 @@
+fun notNullValues(it: Iterator<String>) {
+    it.forEachRemaining { e -> }
+        // SUCCESS
+        // ORIGINAL:    fun forEachRemaining((T) -> Unit): Unit defined in kotlin.collections.Iterator
+        // SUBSTITUTED: fun forEachRemaining((String) -> Unit): Unit defined in kotlin.collections.Iterator
+}
+
+fun mutableNullableValues(it: MutableIterator<String?>) {
+    it.forEachRemaining { e -> }
+        // SUCCESS
+        // ORIGINAL:    fun forEachRemaining((T) -> Unit): Unit defined in kotlin.collections.MutableIterator
+        // SUBSTITUTED: fun forEachRemaining((String?) -> Unit): Unit defined in kotlin.collections.MutableIterator
+}