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615: Use General allocator at all times for now r=grovesNL a=kvark In all user-managed resources, we don't have control of the lifetime. Since we don't know when it's released, we can't use any more specific allocator kind than `General`. Previously, we assumed that buffers created for MAP_READ+COPY_SRC, for example, were one-time buffers created to copy data. However, there appear to be cases where they were used to fill data in once, and then persistently used as a copy source destination. In the future, one WebGPU data transfer story is settled, we'll be able to use `Linear` kind again for all internally managed uploads. I.e. writeBuffer, writeTexture, and createBuffeMappedOnlyAtStart. Co-authored-by: Dzmitry Malyshau <kvarkus@gmail.com>