FIR CFG: revise edge kind between local func node and fun enter node

so that local function enter node can be visited by FIR CFA

#KT-42814 Fixed

compiler/testData/diagnostics/tests/controlFlowAnalysis/assignedInIfElse.kt

@@ -14,4 +14,8 @@ fun foo(arg: Boolean) {
             x.hashCode()
         }
     }
+
+    fun local(): Int {
+        return x.hashCode()
+    }
 }