Simplify jira import startt mutation

app/graphql/mutations/jira_import/start.rb

@@ -23,29 +23,21 @@ module Mutations
                description: 'Project name of the importer Jira project'
 
       def resolve(project_path:, jira_project_key:)
-        project = find_project!(project_path: project_path)
-
-        raise_resource_not_available_error! unless project
+        project = authorized_find!(full_path: project_path)
 
         service_response = ::JiraImport::StartImportService
                              .new(context[:current_user], project, jira_project_key)
                              .execute
         jira_import = service_response.success? ? service_response.payload[:import_data] : nil
-        errors = service_response.error? ? [service_response.message] : []
+
         {
           jira_import: jira_import,
-          errors: errors
+          errors: service_response.errors
         }
       end
 
       private
 
-      def find_project!(project_path:)
-        return unless project_path.present?
-
-        authorized_find!(full_path: project_path)
-      end
-
       def find_object(full_path:)
         resolve_project(full_path: full_path)
       end