Refactor package (routes and error handling, npm peer dependency) (#33111)

routers/api/packages/helm/helm.go

@@ -130,7 +130,7 @@ func DownloadPackageFile(ctx *context.Context) {
 		},
 	)
 	if err != nil {
-		if err == packages_model.ErrPackageFileNotExist {
+		if errors.Is(err, packages_model.ErrPackageFileNotExist) {
 			apiError(ctx, http.StatusNotFound, err)
 			return
 		}