#5865 Bypass ticket permission checks in milestone counts for large milestones
Per [#5112], the permission checks on milestone counts is too expensive. Change it so that, given a cutoff (e.g., 500), if there are more than that threshold, skip the permissions check and round to the nearest hundred (or multiple of the threshold, or some other reasonable rounding) and display as "> x00" where "x00" is whatever the rounded value is.