[GPU] XAttention performance optimization. (#34431) #1918

Job	Run time
Smart_CI	16s
Build	11m 47s
C++ unit tests / C++ unit tests	18m 23s
Store OpenVINO artifacts on a shared drive	47s
CPU functional tests	0s
Python unit tests	-1s
OpenVINO JS API	-1s
Pytorch Layer Tests	-1s
OpenVINO tokenizers extension	-1s
Samples	-1s
JAX Layer Tests	-1s
Pytorch FX Layer Tests	-1s
Python API tests	-1s
TensorFlow Layer Tests	-1s
	31m 4s

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