[gnome-session] (7 commits) Non-fast-forward update to branch wip/benzea/systemd-user-switch

[Benjamin Berg <bberg src gnome org>]

The branch 'wip/benzea/systemd-user-switch' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  6efe538... main: Add systemd gnome-session monitoring code for leader
  ea38968... gnome-session-ctl: Add helper binary for systemd targets
  fc62943... data: Add systemd user units
  e58c7a5... main: Enable systemd usage
  1dc4ef0... manager: Drop DBus restart as it is handled using systemd
  05e7e52... system: Remove is_last_session API as it is unused
  ee41f16... main: Export autostart dir into environment

Commits added to the branch:

  a3cc16a... main: Add systemd gnome-session monitoring code for leader
  bd5a84d... gnome-session-ctl: Add helper binary for systemd targets
  f346fc9... data: Add systemd user units
  8142fbe... main: Enable systemd usage
  41abc6c... manager: Drop DBus restart as it is handled using systemd
  87fd285... system: Remove is_last_session API as it is unused
  6f69bf5... main: Export autostart dir into environment