[CK_TILE] Fix CShuffleEpilogue test to use correct GEMM
accumulator distribution (#4518)
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## Summary
The test was using LDS distribution to create the accumulator tile, but
CShuffleEpilogue expects the GEMM accumulator distribution that
BlockGemm produces. This mismatch caused incorrect data permutation.
## Changes
- Use WarpGemmDispatcher to get correct accumulator distribution
encoding
- Load test input from host-initialized global memory for deterministic
verification
- Shard tests by data type (FP16, FP8) with gfx950-specific FP8 tests
- Extract scale tests into separate target for better organization
- Implement exact permutation verification (all unique values appear
once)
- Reduce tile size from 256x256 to 128x128 to fit in unique fp16 range
- Add parameterized test configurations for various warp layouts and
MFMA types
## Test plan
- [x] Run new cshuffle epilogue tests
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
