FIR LT: support labelled destructured declarations

add missing conversion in the LT to FIR converter
#KT-56759 fixed

compiler/fir/raw-fir/light-tree2fir/src/org/jetbrains/kotlin/fir/lightTree/converter/DeclarationsConverter.kt

@@ -1331,7 +1331,7 @@ class DeclarationsConverter(
     /**
      * @see org.jetbrains.kotlin.fir.builder.RawFirBuilder.Visitor.visitDestructuringDeclaration
      */
-    private fun convertDestructingDeclaration(destructingDeclaration: LighterASTNode): DestructuringDeclaration {
+    internal fun convertDestructingDeclaration(destructingDeclaration: LighterASTNode): DestructuringDeclaration {
         var modifiers = Modifier()
         var isVar = false
         val entries = mutableListOf<FirVariable?>()

compiler/fir/raw-fir/light-tree2fir/src/org/jetbrains/kotlin/fir/lightTree/converter/ExpressionsConverter.kt

@@ -126,6 +126,7 @@ class ExpressionsConverter(
 
             OBJECT_LITERAL -> declarationsConverter.convertObjectLiteral(expression)
             FUN -> declarationsConverter.convertFunctionDeclaration(expression)
+            DESTRUCTURING_DECLARATION -> declarationsConverter.convertDestructingDeclaration(expression).toFirDestructingDeclaration(baseModuleData)
             else -> buildErrorExpression(null, ConeSimpleDiagnostic(errorReason, DiagnosticKind.ExpressionExpected))
         }
     }

compiler/testData/codegen/box/labels/labeledDeclarations.kt

@@ -1,5 +1,4 @@
-// IGNORE_BACKEND_K2_LIGHT_TREE: JVM_IR
-//   Reason: KT-56759
+
 data class A(val a: Int, val b: Int)
 
 fun box() : String