[Test] Migrate AbstractExtendedFirDiagnosticsTest to new infrastructure

compiler/fir/analysis-tests/testData/resolve/extendedCheckers/unused/usedInAnnotationArguments.kt

@@ -0,0 +1,7 @@
+annotation class Ann(val value: Int)
+
+fun foo(): Int {
+    val x = 3
+    @Ann(<!ANNOTATION_ARGUMENT_MUST_BE_CONST!>x<!>) val y = 5
+    return y
+}