Remove Gitlab::ImportExport::ProjectCreator class

lib/gitlab/import_export/project_creator.rb

-module Gitlab
-  module ImportExport
-    class ProjectCreator
-      def initialize(namespace_id, current_user, file, project_path)
-        @namespace_id = namespace_id
-        @current_user = current_user
-        @file = file
-        @project_path = project_path
-      end
-
-      def execute
-        ::Projects::CreateService.new(
-          @current_user,
-          name: @project_path,
-          path: @project_path,
-          namespace_id: @namespace_id,
-          import_type: "gitlab_project",
-          import_source: @file
-        ).execute
-      end
-    end
-  end
-end