[GPU]Improve sdpa_opt kernel by skipping computes of causal mask #14951

Job	Run time
Smart_CI	24s
Build / Build	36m 53s
Python unit tests	8m 57s
OpenVINO tokenizers extension	0s
JS API	0s
OpenVINO Python API Tests	0s
Samples	0s
CPU functional tests	0s
C++ unit tests / C++ unit tests	48s
JAX Layer Tests / JAX Layer Tests	3m 59s
Pytorch Layer Tests / PyTorch Layer Tests	8m 56s
TensorFlow Layer Tests	0s
ci/gha_overall_status_windows	1s
	59m 58s

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