ExecuteUpdateAsync bypasses the EF change tracker, so the user entity
returned by AuthenticateUser still carried the old LastLoginDate and
LastActivityDate. SessionManager.LogSessionActivity then saved that
stale entity in full, reverting LastLoginDate (usually to null)
milliseconds after every login. Setting the properties on the entity
keeps the follow-up save consistent and lets the 60-second activity
guard skip the redundant write during login.
Fixes#17301
Elian Van Cutsem
47f567b6f1