* Fill in undefined var in `Tests_Option_BlogOption`
* Add `defined()` check for `BLOGSUPLOADDIR`
* Suppress deprecated function notices for `is_blog_user()` and `get_dashboard_blog()`
* Check existence of `$user` in `wpmu_log_new_registrations()` before arbitrarily making a database query

Fixes all notices in multisite unit tests.

See #25282.


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