FIR IDE: move low level api testdata sources to the analysis directory

analysis/low-level-api-fir/testdata/multiModuleLazyResolve/whenWithHeiarchy/main/main.kt

@@ -0,0 +1,8 @@
+fun Y.test(): String? {
+    val a = when (this) {
+        is F -> 1
+        is G -> 2
+        else -> return null
+    }
+    return null
+}