Generate navigateToDecompiledLibraryTest from the same test data as navigateToLibrarySourceTest

Change test data format

idea/testData/decompiler/navigation/usercode/ExtensionProperty.source.expected

@@ -0,0 +1,14 @@
+main.kt
+public val String.<1>exProp : String
+get() {
+    return this
+}
+
+public val Int.exProp : Int
+get() {
+    return this
+}
+
+public class Pair<A, B><2>(val first: A, val second: B)
+
+public val <T> Pair<T, T>.<3>exProp : String