Unable to find lib/gitlab/import_export/import_export.yml

Consider using Rails.root.join()

https://sentry.gitlap.com/gitlab/gitlabcom/issues/7568/

Gitlab::ImportExport::Error: No such file or directory @ rb_sysopen - lib/gitlab/import_export/import_export.yml
  app/services/projects/import_export/export_service.rb:45:in `cleanup_and_notify'
    raise Gitlab::ImportExport::Error.new(@shared.errors.join(', '))
  lib/gitlab/metrics/instrumentation.rb:152:in `block in cleanup_and_notify'
    trans.measure_method(#{label.inspect}) { super }
  lib/gitlab/metrics/method_call.rb:23:in `measure'
    retval = yield
  lib/gitlab/metrics/transaction.rb:71:in `measure_method'
    @methods[name].measure(&block)
  lib/gitlab/metrics/instrumentation.rb:152:in `cleanup_and_notify'
    trans.measure_method(#{label.inspect}) { super }
...
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