NPUW: LLMInferRequest - not copy kvcache for last generated token #5493

Job	Run time
Smart_CI	24s
Docker	57s
Build	9m 34s
Python API tests (3.12, openvinogithubactions.azurecr.io/ov_test/ubuntu_24_04_x64:pr-28380) / Python API tests	2m 38s
Python API tests (3.11, openvinogithubactions.azurecr.io/ov_test/ubuntu_22_04_x64:pr-28380) / Python API tests	2m 26s
Python API tests (3.13, openvinogithubactions.azurecr.io/ov_test/ubuntu_20_04_x64_py313:pr-28380) / Python API tests	2m 23s
Python API tests (3.10, openvinogithubactions.azurecr.io/ov_test/debian_10_py310:pr-28380) / Python API tests	3m 12s
Python API tests (3.9, openvinogithubactions.azurecr.io/ov_test/fedora_33:pr-28380) / Python API tests	2m 33s
ci/gha_overall_status_manylinux2014	1s
	24m 8s

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