zink: move tess/geom shader info to vs shader key

zink: move tess/geom shader info to vs shader key

now that there exists a shader key for vertex stages, we can stop modifying
the zink_shader values and instead use this as a more reliable method of detecting
the state

Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8682>