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Description of problem:
The issue prevents system from booting correctly if greenboot service monitor is set to monitor a disabled or un-installed service

Version-Release number of selected component (if applicable):
greenboot-0.15.2-1.el9.x86_64

Steps to Reproduce:
1. set GREENBOOT_MONITOR_SERVICES="httpd" (or any service which is disabled or not installed)
2. reboot

Actual results:
[FAILED] Failed to start Monitor user services.
See 'systemctl status greenboot-service-monitor.service' for details.
[DEPEND] Dependency failed for Boot Completion Check.
[DEPEND] Dependency failed for Mark boot as successful in grubenv.
[DEPEND] Dependency failed for greenboot Success Scripts Runner.

Expected results:
Sep 12 10:54:54 vm systemd[1]: Finished greenboot Health Checks Runner.
Sep 12 10:54:54 vm systemd[1]: greenboot-service-monitor.service: Deactivated successfully.
Sep 12 10:54:54 vm systemd[1]: Starting greenboot Success Scripts Runner...
Sep 12 10:54:54 vm greenboot[1096]: Boot Status is GREEN - Health Check SUCCESS
Sep 12 10:54:54 vm greenboot[1096]: Running Green Scripts...
Sep 12 10:54:54 vm systemd[1]: Finished greenboot Success Scripts Runner.

we ended up rolling back ignition as this feature was broken

Reopening, greenboot-0.15.3-1.el9 should be included in 9.2.