The purpose of the tool has shifted from running a limited set
of performance tests repeatedly to collect performance data
and catch regressions, to a wrapper that drives gnome-shell via
scripts for tests.
With that, the concept of a "default" script doesn't really make
sense anymore.
Instead, turn the argument from an optional flag into a required
parameter. This will allow us to stop bundling the existing tests
in a follow-up commit.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2812>
The original purpose of the tool was to collect performance data
that would optionally be uploaded to a server in Owen's living
room. While the corresponding scripts are still included (although
the server was probably dismantled years ago), the tool is mainly
used for running gnome-shell with scripted tests nowadays.
Rename the tool to reflect that.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2812>
