Print the RUA report date range in the report

[tdpauw]

Add the begin and end date range to the printed report.

<feedback>
  <report_metadata>
    <org_name>...</org_name>
    <email>...</email>
    <extra_contact_info>...</extra_contact_info>
    <report_id>...</report_id>
    <date_range>
      <begin>1656288000</begin>
      <end>1656374399</end>
    </date_range>
  </report_metadata>
</feedback>