KT-9721:

- Kotlin/JS still uses package facades.
Handle them properly in StubClassBuilder parentStack.
- Generate backend-related diagnostics in IDE
using light class generation for file facades.
- Drop PackageFacadeStubCache.

compiler/cli/src/org/jetbrains/kotlin/cli/jvm/compiler/KotlinCoreEnvironment.kt

@@ -370,7 +370,6 @@ public class KotlinCoreEnvironment private constructor(
             with (projectEnvironment.getProject()) {
                 registerService(javaClass<JetScriptDefinitionProvider>(), JetScriptDefinitionProvider())
                 registerService(javaClass<KotlinJavaPsiFacade>(), KotlinJavaPsiFacade(this))
-                registerService(javaClass<KotlinLightClassForFacade.PackageFacadeStubCache>(), KotlinLightClassForFacade.PackageFacadeStubCache(this))
                 registerService(javaClass<KotlinLightClassForFacade.FacadeStubCache>(), KotlinLightClassForFacade.FacadeStubCache(this))
             }
         }