Backmerging commits from Msft dated 25_6_2026#1164

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hdharpure9922:synic_msft_25_6_2026

Commits on Jun 24, 2026

Relax CompileModel validation to accept zero-input OrtModel graphs (#28771)
adrastogi
authored
Clamp derived sequence lengths and KV-cache index in CUDA GroupQueryAttention (#29240)

jiafatom
and
Copilot
authored
Add flash attention for non-quantized CPU GroupQueryAttention (#28962)
tianleiwu
authored