Re-introduce email previews that were broken

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I was going to add the following email previews in https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/5031 but I couldn't quite get them working and it isn't really a blocker to leave them out. We should re-introduce them.

spec/mailers/previews/notify_preview.rb

def issue_moved_email
  # TODO: fails to load, undefined method `id' for 320:Fixnum Did you mean? i

  Notify.issue_moved_email(user.id, issue.id, issue.id, user.id).message
end


def new_gpg_key_email
  cleanup do
    # TODO: I am not sure how to create a GPG key that is actually persisted and has an ID
    gpg_key = GpgKeys::CreateService.new(user, key: 'foo').execute
    # puts "zxcv #{gpg_key.to_yaml} #{gpg_key.persisted?}"

    Notify.new_gpg_key_email(gpg_key.id).message
  end
end

spec/mailers/previews/abuse_report_mailer_preview.rb

class AbuseReportMailerPreview < ActionMailer::Preview
  def notify
    cleanup do
      # TODO: I am not sure how to create a GPG key that is actually persisted and has an ID
      abuse_report = AbuseReport.create(message: 'some messsage', user_id: user.id)
      # puts "zxcv #{abuse_report.to_yaml} #{abuse_report.persisted?}"

      AbuseReportMailer.notify(abuse_report.id).message
    end
  end

  private

  def user
    @user ||= User.last
  end

  def cleanup
    email = nil

    ActiveRecord::Base.transaction do
      email = yield
      raise ActiveRecord::Rollback
    end

    email
  end
end

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cc @mdelaossa