[FIR] add more tests diagnostic tests on data and delegated classes

^KT-63522
^KT-63512
^KT-63042

compiler/testData/codegen/box/delegation/nestedNameClash2.kt

@@ -0,0 +1,16 @@
+// DUMP_IR
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION
+package second
+
+fun box(): String {
+    val data = MyClass(object : Base {})
+    return data.foo()
+}
+
+interface Base {
+    fun foo(): String = "OK"
+}
+
+class MyClass(val prop: second.Base): Base by prop {
+    interface Base
+}