ci/freedreno: create a618-traces and perf jobs

ci/freedreno: create a618-traces and perf jobs

Performance jobs should work better if we fix the device under test to
be the same in every test, instead of using any device from a group of
devices of the same type.

We can do it quickly in LAVA, but it seems more
complicated on Google's farm. So, let's replace the a630 (in Google
farm) with a fixed a618 device to test freedreno traces performance.

Add a618-traces job as well, as we need to confirm that a618 is
generating stable traces with good results before proceeding to track
its performance

Co-authored-by: David Heidelberg <david.heidelberg@collabora.com>
Signed-off-by: David Heidelberg <david.heidelberg@collabora.com>
Signed-off-by: Guilherme Gallo <guilherme.gallo@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22065>