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e759c474 - Use cuBLAS default workspace size in Lt (#153556)

Use cuBLAS default workspace size in Lt (#153556) Summary: Also enables unified workspaces by default for non-FBCODE use cases. Default Lt workspace size is also updated to match cuBLAS logic for default, including for Blackwell (SM 10.0) and GeForce Blackwell (SM 12.0). Recommended defaults are documented here: https://docs.nvidia.com/cuda/cublas/#cublassetworkspace X-link: https://github.com/pytorch/pytorch/pull/153556 Approved by: https://github.com/Skylion007, https://github.com/ngimel Reviewed By: izaitsevfb Differential Revision: D75387537 fbshipit-source-id: 7ec68ba7362c49a3cfc16fa7e46c0ba490a601c1