[gjs] Non-fast-forward update to branch ewlsh/top-level-await-mainloop

[Evan Welsh <ewlsh src gnome org>]

The branch 'ewlsh/top-level-await-mainloop' 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:

  ed669f8... Refactor exit code handling for async exceptions

Commits added to the branch:

  8f2f2eb... Refactor exit code handling for async exceptions