Address key customer-facing issues

[stvnrlly]

Rolling epic with the current key issues

• [x] Report downloads (5 & 7 day) are not working for two partners
  • [x] https://github.com/GSA/notifications-admin/issues/1842
• [x] Reports not appearing as downloadable (WA)
  • [x] https://github.com/GSA/notifications-admin/issues/1859

• [ ] Users prevented from sending at busy times

  • [ ] https://github.com/GSA/notifications-admin/issues/1856
  • [ ] Service sending from wrong number - BLOCKED pending further information
    • [ ] https://github.com/GSA/notifications-admin/issues/1701

[em-herrick]

As we complete these, let's make sure to write the right tests so we don't break these things in the future.