systemctl,core: allow nuking of symlinks to removed units

Before, one the unit file was deleted, install_context_for_removal()
would refuse to look for symlinks. But we can remove dangling symlinks
anyway.

In principle, package installation/deinstallation scripts should do
that before the unit is uninstalled, but they don't always do. Also,
a user might have added additional symlinks manually.

https://bugs.freedesktop.org/show_bug.cgi?id=62395

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