Enable frozen string for import-export specs

Partially addresses:

https://gitlab.com/gitlab-org/gitlab/issues/27703

spec/lib/gitlab/import_export/after_export_strategies/base_after_export_strategy_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Gitlab::ImportExport::AfterExportStrategies::BaseAfterExportStrategy do

spec/lib/gitlab/import_export/after_export_strategies/web_upload_strategy_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Gitlab::ImportExport::AfterExportStrategies::WebUploadStrategy do

spec/lib/gitlab/import_export/after_export_strategy_builder_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Gitlab::ImportExport::AfterExportStrategyBuilder do

spec/lib/gitlab/import_export/attribute_cleaner_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Gitlab::ImportExport::AttributeCleaner do

spec/lib/gitlab/import_export/attribute_configuration_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 # Part of the test security suite for the Import/Export feature

spec/lib/gitlab/import_export/avatar_restorer_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Gitlab::ImportExport::AvatarRestorer do

spec/lib/gitlab/import_export/avatar_saver_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Gitlab::ImportExport::AvatarSaver do

spec/lib/gitlab/import_export/fast_hash_serializer_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Gitlab::ImportExport::FastHashSerializer do

spec/lib/gitlab/import_export/file_importer_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Gitlab::ImportExport::FileImporter do

spec/lib/gitlab/import_export/fork_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe 'forked project import' do

spec/lib/gitlab/import_export/group_project_object_builder_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Gitlab::ImportExport::GroupProjectObjectBuilder do

spec/lib/gitlab/import_export/hash_util_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Gitlab::ImportExport::HashUtil do

spec/lib/gitlab/import_export/import_export_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Gitlab::ImportExport do

spec/lib/gitlab/import_export/importer_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Gitlab::ImportExport::Importer do

spec/lib/gitlab/import_export/lfs_restorer_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Gitlab::ImportExport::LfsRestorer do

spec/lib/gitlab/import_export/lfs_saver_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Gitlab::ImportExport::LfsSaver do

spec/lib/gitlab/import_export/members_mapper_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Gitlab::ImportExport::MembersMapper do

spec/lib/gitlab/import_export/merge_request_parser_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Gitlab::ImportExport::MergeRequestParser do

spec/lib/gitlab/import_export/model_configuration_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 # Part of the test security suite for the Import/Export feature

spec/lib/gitlab/import_export/project_tree_restorer_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 include ImportExport::CommonUtil
 

spec/lib/gitlab/import_export/project_tree_saver_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Gitlab::ImportExport::ProjectTreeSaver do

spec/lib/gitlab/import_export/reader_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Gitlab::ImportExport::Reader do

spec/lib/gitlab/import_export/relation_factory_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Gitlab::ImportExport::RelationFactory do

spec/lib/gitlab/import_export/repo_restorer_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Gitlab::ImportExport::RepoRestorer do

spec/lib/gitlab/import_export/repo_saver_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Gitlab::ImportExport::RepoSaver do

spec/lib/gitlab/import_export/saver_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 require 'fileutils'
 

spec/lib/gitlab/import_export/shared_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 require 'fileutils'
 

spec/lib/gitlab/import_export/uploads_manager_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Gitlab::ImportExport::UploadsManager do

spec/lib/gitlab/import_export/uploads_restorer_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Gitlab::ImportExport::UploadsRestorer do

spec/lib/gitlab/import_export/uploads_saver_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Gitlab::ImportExport::UploadsSaver do

spec/lib/gitlab/import_export/version_checker_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 include ImportExport::CommonUtil
 

spec/lib/gitlab/import_export/wiki_repo_saver_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Gitlab::ImportExport::WikiRepoSaver do

spec/lib/gitlab/import_export/wiki_restorer_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Gitlab::ImportExport::WikiRestorer do