Missing `UserChangedEvent` after setting attributes

[susnux]

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Steps to reproduce

1. See avatar is the fallback (initials) of an user but due to missing display name its the userid
2. Setup SAML to also populate display name from IdP
3. See avatar is still based on initials of user id

Expected behavior

The setting of the display name should emit an UserChangedEvent so that the server will re-generate an avatar.

Actual behaviour

Event is not emitted and thus the old avatar is not replaced.

Server configuration

Nextcloud version: 33

[susnux]

Work around: Run occ user:clear-avatar-cache in a cron job. Not good but works.

cc @come-nc