vulkan: Fix pipeline libraries with dynamic-only VI or FSR state

vulkan: Fix pipeline libraries with dynamic-only VI or FSR state

When we initialize the graphics pipeline state, we skip VI and FSR state
if they're 100% dynamic.  We need to do this if the current set of
dynamic things contains VI/FSR or if the set of dynamic state already in
the vk_graphics_pipeline_state has them dynamic.  Look state->dynamic
after we've merged instead of just looking at the dynamic set from the
VkGraphicsPipelineCreateInfo we were passed.

Also, when we validate, we need to assume that VI and FSR exist or else
we'll assert if dynamic VI or FSR are set.

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17696>