feat(users): add disabled users to storage stats

[tcitworld]

Also add a condition on the lastLogin query for total number of users, just in case there's another app that uses this specific key

[come-nc]

You should rely on IUserManager::countDisabledUsers() instead of querying the DB

[tcitworld]

Oops, forgot about this one. I'll might as well change countUserEntries to use IUserManager::countSeenUsers then.

[github-actions]

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