doc/rl-2511: document victorialogs package migration

- `space-orbit` package has been removed due to lack of upstream maintenance. Debian upstream stopped tracking it in 2011.

- `command-not-found` package is now disabled by default; it works only for nix-channels based systems, and requires setup for it to work.

- `victoriametrics` no longer contains VictoriaLogs components. These have been separated into the new package `victorialogs`.

- `gnome-keyring` no longer ships with an SSH agent anymore because it has been deprecated upstream. You should use `gcr_4` instead, which provides the same features. More information on why this was done can be found on [the relevant GCR upstream PR](https://gitlab.gnome.org/GNOME/gcr/-/merge_requests/67).

- `lima` package now only includes the guest agent for the host's architecture by default. If your guest VM's architecture differs from your Lima host's, you'll need to enable the `lima-additional-guestagents` package by setting `withAdditionalGuestAgents = true` when overriding lima with this input.

- `vmalert` now supports multiple instances with the option `services.vmalert.instances."".enable`

- [`services.victorialogs.package`](#opt-services.victorialogs.package) now defaults to `victorialogs`, as `victoriametrics` no longer contains the VictoriaLogs binaries.

- The `wstunnel` module was converted to RFC42-style settings, you will need to update your NixOS config if you make use of this module.

## Other Notable Changes {#sec-release-25.11-notable-changes}