JetDiagnosticsTest migrated to TestGenerator

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

compiler/testData/diagnostics/tests/dataFlowInfoTraversal/UnaryExpression.kt

@@ -0,0 +1,14 @@
+fun bar(x: Int): Int = x + 1
+fun baz(b: Boolean): Boolean = !b
+
+fun foo() {
+    val x: Int? = null
+
+    bar(<!UNSAFE_CALL!>-<!>x)
+    if (x != null) bar(-x)
+    bar(<!UNSAFE_CALL!>-<!>x)
+
+    val b: Boolean? = null
+    baz(<!UNSAFE_CALL!>!<!>b)
+    if (b != null) baz(!b)
+}