Update all User.is_authenticated/is_anonymous usage to access as properties.
Review Request #11620 — Created May 26, 2021 and submitted
Old versions of Django defined
User.is_anonymous()as methods, but in modern versions they're
properties. Method usage was deprecated in Django 1.10, but still worked
until Django 2.0.
We're now using the property form for these checks. This is compatible
with all supported versions of Django targeted for Djblets 3.0.
Unit tests pass on Django 1.11 and on 3.2 (when combined with other