ci: Add manual rules variations

If you're only affecting one or a couple of drivers, it would be nice if
your pipeline buttons on the web UI weren't full of manual run buttons for
all the other drivers.

This is a bunch of duplicated lines, but less than it could have been now
that we have !references.

In some of these cases (i915g, nouveau, etnaviv), we have no non-manual
jobs for those drivers, so I could have just rewritten the original
"driver-rules" to "driver-manual-rules".  I decided to keep things
consistent between drivers, though, because this is all esoteric enough to
readers already without making different drivers' rules look different.

Fixes: #4891 (closed)