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zink: add driver workarounds for depth bias factor

Mike Blumenkrantz requested to merge zmike/mesa:zink-bias into main

currently, vulkan drivers expect to use the passed factor with no scaling, which differs from the GL behavior where scaling is handled by the driver

until such time that an extension is created to enable GL behavior, every driver that performs scaling on this value will need its own driver_workarounds entry to fix this behavior

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