[FIR-TEST] Add new testdata generated after changes in previous commit

compiler/testData/diagnostics/tests/inner/classesInClassObjectHeader.fir.kt

@@ -0,0 +1,11 @@
+class Test {
+    @`InnerAnnotation` @InnerAnnotation
+    companion object : StaticClass(), InnerClass() {
+
+    }
+
+    annotation class InnerAnnotation
+    open class StaticClass
+
+    open inner class InnerClass
+}