New J2K: consider in-context declarations while performing conversion on copy-paste plain text conversion

#KT-32602 fixed

nj2k/testData/copyPastePlainText/InClassContextProperty.expected.kt

@@ -0,0 +1,6 @@
+class A {
+    val str: String = TODO()
+    internal fun f() {
+        str.length
+    }
+}