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

compiler/testData/diagnostics/tests/controlFlowAnalysis/nestedTryFinally.fir.kt

@@ -0,0 +1,24 @@
+fun use(arg: String?) = arg
+
+fun sample(): String? {
+    try {
+        if (false) {
+            return "fail"
+        } else {
+            if (false) {
+                if (false) {
+                    var foo: String? = null
+                    try {
+                        foo = "test"
+                    } catch (e: Exception) {
+                        return "fail"
+                    } finally {
+                        use(foo) // 'foo' is initialized here
+                    }
+                }
+                return "fail"
+            }
+        }
+    } finally {}
+    return null
+}