Fix various off-by-one errors in statistics time ranges (#40193)

Co-authored-by: Shlee <github@shl.ee>

app/controllers/admin/instances_controller.rb

@@ -17,7 +17,7 @@ module Admin
 
       @instance_moderation_note = @instance.moderation_notes.new
       @instance_moderation_notes = @instance.moderation_notes.includes(:account).chronological
-      @time_period = (6.days.ago.to_date...Time.now.utc.to_date)
+      @time_period = (6.days.ago.to_date..Time.now.utc.to_date)
       @action_logs = Admin::ActionLogFilter.new(target_domain: @instance.domain).results.limit(LOGS_LIMIT)
     end