When setting up coredump handling, if there are old mounts in a deleted state (e.g. from an older installation),
systemd might fail to activate the new `.mount` unit properly because it assumes the path is already mounted.
Explicitly unmount `/var/lib/systemd/coredump` before proceeding with the setup to ensure a clean state.
Fix: scylladb/scylla-enterprise#5692Closesscylladb/scylladb#28300
6b3ce5fdcc