[FIR-TEST] Move analysis tests to separate module

compiler/fir/analysis-tests/testData/lightClasses/nestedClasses.kt

@@ -0,0 +1,8 @@
+interface A<T>
+
+class B<E> {
+    inner class C : A<E>
+    class D : A<String>
+}
+
+// LIGHT_CLASS_FQ_NAME: B