KT-59732 [FIR] Get rid of FirErrorImport node

It's no longer relevant, since it's not created anywhere

compiler/fir/tree/tree-generator/src/org/jetbrains/kotlin/fir/tree/generator/FirTreeBuilder.kt

@@ -79,7 +79,6 @@ object FirTreeBuilder : AbstractFirTreeBuilder() {
 
     val import by element(Declaration)
     val resolvedImport by element(Declaration, import)
-    val errorImport by element(Declaration, import, diagnosticHolder)
 
     val loop by sealedElement(Expression, statement, targetElement)
     val errorLoop by element(Expression, loop, diagnosticHolder)

compiler/fir/tree/tree-generator/src/org/jetbrains/kotlin/fir/tree/generator/ImplementationConfigurator.kt

@@ -72,10 +72,6 @@ object ImplementationConfigurator : AbstractFirTreeImplementationConfigurator()
             }
         }
 
-        impl(errorImport) {
-            delegateFields(listOf("aliasName", "importedFqName", "isAllUnder", "source"), "delegate")
-        }
-
         fun ImplementationContext.commonAnnotationConfig() {
             defaultEmptyList("annotations")
             default("coneTypeOrNull") {

compiler/fir/tree/tree-generator/src/org/jetbrains/kotlin/fir/tree/generator/NodeConfigurator.kt

@@ -530,10 +530,6 @@ object NodeConfigurator : AbstractFieldConfigurator<FirTreeBuilder>(FirTreeBuild
             )
         }
 
-        errorImport.configure {
-            +field("delegate", import)
-        }
-
         annotation.configure {
             +field("useSiteTarget", annotationUseSiteTargetType, nullable = true, withReplace = true)
             +field("annotationTypeRef", typeRef, withReplace = true).withTransform()