Update deprecated code for datagrid state and Django Evolution settings.

Review Request #12323 — Created June 1, 2022 and submitted — Latest diff uploaded

Information

Review Board
release-5.0.x

Reviewers

This addresses some deprecation warnings in both our datagrid code and
in Django Evolution.

The load_extra_state() methods in datagrids now return lists of
modified fields, instead of booleans. This is used for more selective
profile saving, and was introduced in Djblets 3.

Django Evolution 2.2 introduced a new top-level DJANGO_EVOLUTION
setting, which nests other settings. We now use this instead of a
top-level CUSTOM_EVOLUTIONS setting.

Verified these deprecation warnings went away.

Tested that the settings saved in the datagrids used in
load_extra_state() ("Show Closed" and "Show Archived") were both
properly preserved and loaded.

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