grub-boot-success.timer cannot be disabled as it is statically linked, this is causing issue for edge devices (Image based OS) which uses greenboot custom health-check to measure boot success.
The timer can be helpful for desktop related operation but for headless operation it doesn't make much sense, so another suggestion can be to move timer to a separate sub-package which edge device can choose not to install to.

Reproducible: Always

Steps to Reproduce:
1. Install rhel for edge system with presets added in /usr/lib/systemd/user-preset/50-osbiuld.preset "disable grub-boot-success.timer"
2. add a script with "exit 1" in /etc/greenboot/check/required.d/
3. restart 
4. ssh into system and instantly validate the boot_success flag
5. check systemctl --user status grub-boot-success.timer
6. wait for two minute.
7. validate the boot_success flag
Actual Results:  
1. systemctl --user status grub-boot-success.timer shows as active
2. boot_success flag changes fro 0 to 1.


Expected Results:  
1. grub-boot-success.timer to be disabled
2. boot_success not to change from 0 to 1 after two mins.

additional issue details: https://github.com/fedora-iot/greenboot/issues/108