[CI] Initial tests for SM100 Blackwell runner

[mgoin]

Right now we are just focusing on kernels and tests that can only run on Blackwell: FP8+NVFP4 kernels, flashinfer attention, cutlass mla, fused allreduce+rmsnorm

[github-actions]

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[gemini-code-assist]

Code Review

This pull request introduces initial tests for the SM100 Blackwell architecture by updating the Buildkite pipeline configuration. The changes add new test commands and their corresponding source file dependencies covering attention, quantization, and fusion kernels. The review suggests refining the source file dependencies to ensure they accurately reflect the code being tested.