Move mount/unmount interaction and handling to Cinnamon

[mtwebster]

This brings in a few more dialogs and replaces csd-automount for mount detection and handling.

ref:
linuxmint/cinnamon-settings-daemon#445

[github-actions]

Best-practices scanner

This is a regex-based check for API usage that can pose security, performance or
maintainability issues, or that may already be provided by Cinnamon. Having code flagged
by it doesn't automatically disqualify a pull request.

This check is not perfect will not replace a normal review.

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Found 3 potential issue(s):

⚠️ gio_volume_monitor

js/ui/automountManager.js:31

this._volumeMonitor = Gio.VolumeMonitor.get();

Use Main.placesManager instead of Gio.VolumeMonitor directly.
PlacesManager provides a unified API for bookmarks, mounts, volumes,
and drives with debounced updates and safe eject/unmount handling.

js/ui/autorunManager.js:169

this._volumeMonitor = Gio.VolumeMonitor.get();

Use Main.placesManager instead of Gio.VolumeMonitor directly.
PlacesManager provides a unified API for bookmarks, mounts, volumes,
and drives with debounced updates and safe eject/unmount handling.

⚠️ gtk_forbidden

js/ui/cinnamonMountOperation.js:25

<interface name="org.Gtk.MountOperationHandler"> \

Most Gtk APIs cannot be used in the Cinnamon runtime.
Use St (Shell Toolkit) equivalents instead.
Allowed Gtk APIs: IconTheme, DirectionType, TextDirection, PositionType,
accelerator_parse, accelerator_get_label, accelerator_name,
Settings, Widget.get_default_direction.

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Automated pattern check.