JetDiagnosticsTest migrated to TestGenerator

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

compiler/testData/diagnostics/tests/regressions/kt287.kt

@@ -0,0 +1,12 @@
+// KT-287 Infer constructor type arguments
+
+import java.util.*
+
+fun attributes() : Map<String, String> = HashMap() // Should be inferred;
+val attributes : Map<String, String> = HashMap() // Should be inferred;
+
+fun foo(<!UNUSED_PARAMETER!>m<!> : Map<String, String>) {}
+
+fun test() {
+    foo(HashMap())
+}