Earlier, we were using 'send_event' in
'notify_realm_custom_profile_fields' which can lead to a situation,
if any db operation is added after the 'send_event' in the action
functions using it, where we enqueue event but the action function
fails at a later stage.
Events should not be sent until we know we're not rolling back.
Fixes part of #30489.
e7f2a0958a