Provided we use the correct version of the SpiderMonkey shell, we
can perform checks using the same engine that is used by gjs.
However some engine features are opt-in, so the set of features enabled
by gjs and js102 may differ. The obvious option for avoiding this is
replacing js102 with gjs for tests.
For that reason the check-potfiles.js script has been ported to gjs
and a second (simpler) script to replace `js102 --compileonly` was
added. This work happened in a separate repository to make sharing
between different JS-based projects easier.
Update the CI image to pull in those scripts and include gjs.
This will also address the issue that `js102 --compileonly` does not
handle modules.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2193>
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