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

compiler/testData/diagnostics/tests/inner/qualifiedExpression/importNestedClass.fir.kt

@@ -0,0 +1,17 @@
+// FILE: a.kt
+class A {
+    class B {
+        class C
+    }
+}
+
+// FILE: b.kt
+import A.B
+import A.B.C
+
+val a = A()
+val b = B()
+val ab = A.B()
+val c = C()
+val bc = B.C()
+val abc = A.B.C()