[FIR] Properly create edges from return expression to finally block

^KT-48376 Fixed

compiler/fir/analysis-tests/testData/resolve/cfg/variableInitializedInTryBlock.kt

@@ -0,0 +1,19 @@
+// DUMP_CFG
+// ISSUE: KT-48376
+
+fun test() {
+    val b: Boolean
+    try {
+        val s = getStringOrNull() ?: return
+        b = s.length != 0
+    } finally {
+        test()
+    }
+    takeBoolean(b)
+}
+
+fun takeBoolean(b: Boolean) {}
+
+fun getStringOrNull(): String? {
+    return "hello"
+}