Tested that commbots username gets fetched (was seting with staging identity, because prod identity doesn't yet have Bartek's changes. I verified that prod identity also has commot in `reservedUserIdentifiers`).
Tested that usernames of users registered with identity still get fetched.
Verified that for a user with `usingCSAT = false` the usernames are not missing. Verified that usernames of users registered with `usingCSAT = false` are also present