ci: Set default verbosity to 1 and allow changing it
The logs will contain more messages by default, which should help with debugging test failures in CI.
You can also control these variables if you start a pipeline from https://gitlab.gnome.org/GNOME/tracker/pipelines/new, for example you could rerun the test suite with TRACKER_VERBOSITY=3 to see many more messages. (We don't do this by default as each log file would be enourmous).
Depends on tracker!145
Edited by Sam Thursfield