[FIR] KT-55666: Support labels to local functions

^KT-55666 Fixed

compiler/testData/diagnostics/tests/kt55666.kt

@@ -0,0 +1,19 @@
+// FIR_IDENTICAL
+
+inline fun l2f1(p: () -> Unit) {}
+
+fun label2simple1() {
+    l2f1 { return@label2simple1 }
+
+    fun local() {
+        l2f1 { return@local }
+    }
+
+    labelLocal@ fun labelledLocal() {
+        l2f1 { return@labelLocal }
+    }
+}
+
+fun main() {
+    label2simple1()
+}