Chris Down c301966df7 core: do not leak resources when handling stale alias state on reload (#41986)
The fix for the corrupted state when units become aliased on reload
leaks the now-aliased unit's resources, which become untracked and
essentially lost.

While fixing the state corruption is of course necessary, leaking
processes/etc. is not ideal for a system and service manager, so
instead attempt to keep track of them by creating stub units
on-the-fly.
This way resources are not leaked, there are clear indications of
where they moved, and all state can be tracked as expected.
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Systemd

System and Service Manager

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