JetDiagnosticsTest migrated to TestGenerator

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

compiler/testData/diagnostics/tests/scopes/kt1738.kt

@@ -0,0 +1,11 @@
+//KT-1738 Make it possible to define visibility for constructor parameters which become properties
+
+package kt1738
+
+class A(private var i: Int, var j: Int) {
+}
+
+fun test(a: A) {
+    a.<!INVISIBLE_MEMBER!>i<!>++
+    a.j++
+}