This was initially introduced as a temporary flag to be able to get more
information. But if we get this kind of issue again, we'll need
something like this logging to determine the source of the session
collision. Rather than removing the code and adding it back in later,
convert this temporary switch into an opt-in setting that can be used
again in the future.
BREAKING_CHANGE: 'safe_session.log_request_user_changes' switch no
longer exists and is replaced with the 'LOG_REQUEST_USER_CHANGES' django
setting which defaults to 'False'
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