With some of the jobs migrated to the new brask and nissa devices, we can
increase zink-on-anv coverage on brya. Reduce the fraction of Piglit
tests and introduce fractional GLESCTS testing.
Also increase the parallelism of the zink nightly job, but lower its
FDO_CI_CONCURRENT variable to avoid OOMkills. To accommodate this,
decrease the parallelism of the anv-adl-full job.
Additionally, drop redundant HWCI_START_WESTON from full runs that
inherit the variable from their pre-merge jobs.
Signed-off-by: Valentine Burley <valentine.burley@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33671>