JetDiagnosticsTest migrated to TestGenerator

- test data files renamed from *.jet to *.kt

compiler/testData/diagnostics/tests/scopes/kt1805.kt

@@ -0,0 +1,20 @@
+package kt1805
+//KT-1805 Better diagnostic for access to private field of parent class
+
+open class Some {
+    private val privateField = 12
+}
+
+class SomeSubclass : Some() {
+    fun test() {
+        this.<!INVISIBLE_MEMBER!>privateField<!> // 1. Unresolved reference
+    }
+}
+
+fun test() {
+    val s2 = Some()
+    s2.<!INVISIBLE_MEMBER!>privateField<!> // 2. Can't access to 'privateField' in Some
+
+    val s1 = SomeSubclass()
+    s1.<!INVISIBLE_MEMBER!>privateField<!> // 3. Unresolved reference
+}