kobotoolbox / kpi / 14201997760 / 1

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fix(massEmails): throttle mass email send (#5641)

### 📣 Summary
Limit the rate of emails sent per second to avoid hitting SES limits.


### 👀 Preview steps

1. ℹ️ have at least 2 users
2. In your settings, set `MASS_EMAIL_THROTTLE_PER_SECOND` to 1
3. Update the `get_inactive_users` query to use a timedelta of 0
4. Create a MassEmailConfig that uses the inactive users query
5. Clear the redis cache and reschedule the the mass-email cron as
necessary so you don't have to wait for the send. `redis-cli KEYS
"*mass_emails*" | xargs redis-cli DEL` will clear the relevant keys when
run in the redis container
6. Open the kpi_worker logs
7. Add the new config to the daily send
8. 🟢 Monitor the sends in the kpi worker logs. There should be about 5
seconds between `Processing MassEmailRecord(id)` logs

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