[FIR] Introduce & use FirTypeRef.coneType

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

@@ -418,7 +418,7 @@ class DeclarationsConverter(
                             delegatedSuperTypeRef = buildResolvedTypeRef {
                                 type = ConeClassLikeTypeImpl(
                                     implicitEnumType.type.lookupTag,
-                                    arrayOf(selfType.coneTypeUnsafe()),
+                                    arrayOf(selfType.type),
                                     isNullable = false
                                 )
                             }

compiler/fir/raw-fir/psi2fir/src/org/jetbrains/kotlin/fir/builder/RawFirBuilder.kt

@@ -490,7 +490,7 @@ class RawFirBuilder(
                     delegatedSuperTypeRef = buildResolvedTypeRef {
                         type = ConeClassLikeTypeImpl(
                             implicitEnumType.type.lookupTag,
-                            delegatedSelfTypeRef?.coneTypeUnsafe<ConeKotlinType>()?.let { arrayOf(it) } ?: emptyArray(),
+                            delegatedSelfTypeRef?.coneType?.let { arrayOf(it) } ?: emptyArray(),
                             isNullable = false,
                         )
                     }