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* [CK_TILE] fmha: Add query padding support to backward pass Introduces support for query sequence padding (q_padding) in the FMHA backward pass kernels. - Passing `seqlen_q_ptr` to the backward kernels to distinguish logical from physical sequence lengths. - Updating `OGradDotO`, `ConvertQGrad`, and `DQDKDV` kernels to respect logical lengths and handle zero-length sequences. - Aligning LSE indexing in the forward kernel with the padded layout for consistency. - Adding a new GTest suite (`test_fmha_bwd_kernel_padding.cpp`) with comprehensive tests for various padding scenarios, including zero-length sequences and deterministic mode. * fix clang format * Adapt fmha_bwd_runner.cpp to new q, kv sequence padding Add backward q/kv sequence padding unit tests. * [CK_TILE] fmha: Unify sequence length and padding handling Refactor the handling of sequence lengths and padding in the FMHA forward and backward kernels to provide a more unified and flexible interface. - Replaced `seqstart_padded_*_ptr` with a more robust system that uses `seqstart_*_ptr` for physical sequence lengths and introduces `seqlen_*_ptr` and `cu_seqlen_*_ptr` for logical (unpadded) lengths. - Established a clear order of precedence for determining sequence length: cumulative lengths (`cu_seqlen_*_ptr`) take priority, followed by per-sequence lengths (`seqlen_*_ptr`), and finally physical lengths derived from `seqstart_*_ptr`. - Clarified the distinction between "group mode" and "batch mode" and how sequence lengths are handled in each case. - Renamed `cu_seqlen_kv_ptr` to `cu_seqlen_k_ptr` for consistency. - Updated comments and documentation to reflect the new argument structure and usage. --------- Co-authored-by: illsilin_amdeng <Illia.Silin@amd.com>