Changes for WT-12654 are currently relying on WT-12488, the removal of join cursors. However the removal may not take place because it is being used. If the removal does not happen, we will need to revise the statistics join code that was once relying on this change. Areas are marked with a fixme under this ticket.

Such as in {{ __wt_stat_join_clear_all,}} and

stat.py:294 -
{{ print_func('join', None, join_stats, 'CONN')}}