Fix for KT-13695, KT-13159 J2K: Invalid conversion context setup for plain text pastes

Extending, Implementing, imports from paste target file previously not implemented

idea/testData/copyPaste/plainTextConversion/Override.dependency.java

@@ -0,0 +1,5 @@
+package test;
+
+public class JavaParent {
+    public void subject() {}
+}