units: use SuccessAction=exit-force in systemd-exit.service

Fixes #10414.

v2:
- rename .service.in to .service
- rename 'exit' to 'exit-force'

units/user/meson.build

@@ -14,6 +14,7 @@ units = [
         'sockets.target',
         'sound.target',
         'timers.target',
+        'systemd-exit.service',
         'systemd-tmpfiles-clean.timer',
 ]
 
@@ -23,7 +24,6 @@ foreach file : units
 endforeach
 
 in_units = [
-        'systemd-exit.service',
         'systemd-tmpfiles-clean.service',
         'systemd-tmpfiles-setup.service',
 ]

units/user/systemd-exit.service

@@ -13,7 +13,4 @@ Documentation=man:systemd.special(7)
 DefaultDependencies=no
 Requires=shutdown.target
 After=shutdown.target
-
-[Service]
-Type=oneshot
-ExecStart=@SYSTEMCTL@ --user --force exit
+SuccessAction=exit-force