replace cutlass submodule references with explicit build step #3234
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this has the benefit of not weighing down CI builds on non-CUDA platforms, and also enables shallow clone to make builds on CUDA platforms lighter weight. The cutlass checkout alone is 210MiB, which this commit saves on platforms that don't need it.
I don't have a modern enough CUDA GPU available to run with flash-attention, but I have tested on older CUDA machine as well as on MacOS, and modulo the asserts for the NVIDIA hardware version, the build completes as expected.