NPUW: LLMInferRequest - not copy kvcache for last generated token #16150

Job	Run time
Smart_CI	22s
Build / Build	42m 19s
JS API	2m 52s
Samples	9m 29s
Python unit tests	13m 51s
CPU functional tests	47m 43s
OpenVINO Python API Tests (3.9)	4m 8s
OpenVINO Python API Tests (3.10)	4m 14s
OpenVINO Python API Tests (3.11)	4m 23s
OpenVINO Python API Tests (3.12)	5m 5s
OpenVINO tokenizers extension / OpenVINO tokenizers extension	9m 26s
C++ unit tests / C++ unit tests	22m 0s
JAX Layer Tests / JAX Layer Tests	7m 41s
Pytorch Layer Tests / PyTorch Layer Tests	28m 17s
TensorFlow Layer Tests / TensorFlow Layer Tests	35m 22s
ci/gha_overall_status_windows	1s
	3h 57m 13s

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