Fixed endless generations in test_callback_one_string test #4357

Job	Run time
cpp-beam_search_causal_lm-ubuntu (./build/samples/cpp/beam_search_causal_lm/beam_search_causal_lm)	16m 37s
cpp-beam_search_causal_lm-Qwen1_5-7B-Chat	14m 44s
cpp-beam_search_causal_lm-Phi-2	16m 24s
cpp-beam_search_causal_lm-ubuntu (python ./samples/python/beam_search_causal_lm/beam_search_causa...	18m 3s
cpp-greedy_causal_lm-Qwen-7B-Chat	9m 49s
cpp-greedy_causal_lm-windows	34m 22s
cpp-multinomial-greedy_causal_lm-ubuntu	18m 17s
cpp-beam_search_causal_lm-notus-7b-v1	12m 59s
cpp-chat_sample-ubuntu	16m 32s
cpp-continuous-batching-macos	18m 22s
cpp-continuous-batching-ubuntu	13m 9s
cpp-continuous-batching-windows	26m 7s
cpp-greedy_causal_lm-redpajama-3b-chat	14m 36s
cpp-Phi-1_5	8m 1s
cpp-prompt_lookup_decoding_lm-ubuntu	12m 30s
cpp-speculative_decoding_lm-ubuntu	13m 40s
visual_language_chat_sample-ubuntu-internvl2	23m 8s
visual_language_chat_sample-ubuntu-minicpm_v2_6	8m 30s
visual_language_chat_sample-ubuntu-llava_1_5 / visual_language_chat_sample-ubuntu-llava	30m 2s
visual_language_chat_sample-ubuntu-llava_next / visual_language_chat_sample-ubuntu-llava	33m 27s
ci/gha_overall_status_causal_lm	1s
	5h 59m 20s

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