Mark as single-instance using X-GNOME-SingleWindow key
This is a GNOME-specific key, but we honor it in Plasma as of plasma/plasma-workspace!1309. I have proposed upstreaming it as "SingleInstance" as part of the FDO Desktop spec in https://gitlab.freedesktop.org/xdg/xdg-specs/-/merge_requests/53 Until that is merged, we can just use the GNOME key which works just fine.
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