keep driver's pipelineCacheUUID valid and use it for replay #3556
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This stops renderdoc from modifying the GPU driver's UUID to keep the applications' pipeline cache active, speeding up app launch when renderdoc is attached in Vulkan. Tested on CS2/Vulkan. Given that the application has to provide SPIR-V even when providing a pipeline cache, this does not prevent renderdoc from capturing valid SPIR-V for shader modification and SPIR-V visualization.