Remove diversion of udev rule 60-cdrom_id.rules

The supported mechanism to override udev rules is to mask them in /etc with a symlink to /dev/null. Do so instead of diverting.

Diversions are incompatible with image-based systems as they are local, live modifications of the vendor tree. Diversions in /lib/ are also going to clash with completing the usrmerge migration.

As a bonus, maintainer scripts will no longer needed in the Debian release after the one where this change ships, simplifying the package.

Closes: #1035667