ci/turnip: Trim the a630 VK run a bit.

We have a lot of spilling coverage in a618 pre-merge, don't do it all (~2
minutes) here.  Also, force-gmem touch testing should probably test less than
the default run does!

This should help make up for having added the tu-zink run.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17125>
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