This commit adds a 'skip-delay' option to the
'send_zulip_update_announcements' management command.
It will be useful for self-hosted servers after 9.0 upgrade to
avoid the 24 hour delay to receive update messages after group
DM is sent to the admins.
One can run the management command with the --skip-delay flag
to immediately send the update messages.
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read the Zulip documentation.