freedreno/ci: Switch a630 jobs over to manual, add a618 jobs to fill in the gaps

The a630 runners are not responding atm, so switch the jobs to manual for the time being.

Note the other fd-farm runners are responding fine, which is why I didn't take the entire farm offline.

I've added a618 egl/piglit/skqp jobs to fill in some of the gaps in coverage.