[LL FIR] adapt RawFirNonLocalDeclarationBuilder for new FirDesignation

Effectively nothing changed right now, but now it is possible to process
`FirScript` as `containingDeclaration` inside `moveNext`

^KT-65345

analysis/low-level-api-fir/src/org/jetbrains/kotlin/analysis/low/level/api/fir/api/FirDesignation.kt

@@ -102,11 +102,6 @@ class FirDesignation(
         }
 
     val scriptOrNull: FirScript? get() = path.getOrNull(0) as? FirScript ?: path.getOrNull(1) as? FirScript ?: target as? FirScript
-
-    /**
-     * This property exists only for compatibility and should be dropped after KT-65345
-     */
-    val classPath: List<FirRegularClass> get() = path.filterIsInstance<FirRegularClass>()
 }
 
 fun ExceptionAttachmentBuilder.withFirDesignationEntry(name: String, designation: FirDesignation) {
@@ -132,7 +127,7 @@ private fun collectDesignationPath(target: FirElementWithResolveState): List<Fir
         is FirConstructor,
         is FirEnumEntry,
         is FirPropertyAccessor,
-        is FirErrorProperty
+        is FirErrorProperty,
         -> {
             requireIsInstance<FirCallableDeclaration>(target)
             // We shouldn't try to build a designation path for such fake declarations as they

analysis/low-level-api-fir/src/org/jetbrains/kotlin/analysis/low/level/api/fir/lazy/resolve/RawFirNonLocalDeclarationBuilder.kt

@@ -99,13 +99,14 @@ internal class RawFirNonLocalDeclarationBuilder private constructor(
                 functionsToRebind = functionsToRebind,
                 replacementApplier = replacementApplier
             )
+
             builder.context.packageFqName = rootNonLocalDeclaration.containingKtFile.packageFqName
             if (rebindContainingSymbol) {
                 @OptIn(PrivateForInline::class)
                 builder.context.forcedContainerSymbol = designation.target.symbol
             }
 
-            return builder.moveNext(designation.classPath.iterator(), containingClass = null)
+            return builder.moveNext(designation.path.iterator(), containingDeclaration = null)
         }
     }
 
@@ -316,8 +317,9 @@ internal class RawFirNonLocalDeclarationBuilder private constructor(
         }
     }
 
-    private fun moveNext(iterator: Iterator<FirDeclaration>, containingClass: FirRegularClass?): FirDeclaration {
+    private fun moveNext(iterator: Iterator<FirDeclaration>, containingDeclaration: FirDeclaration?): FirDeclaration {
         if (!iterator.hasNext()) {
+            val containingClass = containingDeclaration as? FirRegularClass
             val visitor = VisitorWithReplacement(containingClass)
             return when (declarationToBuild) {
                 is KtProperty -> {
@@ -350,7 +352,7 @@ internal class RawFirNonLocalDeclarationBuilder private constructor(
         }
 
         val parent = iterator.next()
-        if (parent !is FirRegularClass) return moveNext(iterator, containingClass = null)
+        if (parent !is FirRegularClass) return moveNext(iterator, containingDeclaration = null)
 
         val classOrObject = parent.psi
         if (classOrObject !is KtClassOrObject) {