Add a choice of how to end streaming from callback: STOP or CANCEL #6456

Job	Run time
cpp-beam_search_causal_lm-notus-7b-v1	3m 20s
cpp-beam_search_causal_lm-Phi-2	3m 7s
cpp-beam_search_causal_lm-Qwen1_5-7B-Chat	2m 44s
cpp-beam_search_causal_lm-ubuntu (./build/samples/cpp/beam_search_causal_lm/beam_search_causal_lm)	6m 5s
cpp-beam_search_causal_lm-ubuntu (python ./samples/python/beam_search_causal_lm/beam_search_causa...	6m 12s
cpp-chat_sample-ubuntu	5m 27s
cpp-continuous-batching-macos	7m 15s
cpp-continuous-batching-ubuntu	4m 1s
cpp-continuous-batching-windows	10m 56s
cpp-greedy_causal_lm-Qwen-7B-Chat	3m 11s
cpp-greedy_causal_lm-redpajama-3b-chat	4m 23s
cpp-greedy_causal_lm-windows	10m 18s
cpp-multinomial-greedy_causal_lm-ubuntu	4m 22s
cpp-Phi-1_5	3m 23s
cpp-prompt_lookup_decoding_lm-ubuntu	2m 37s
cpp-speculative_decoding_lm-ubuntu	3m 11s
visual_language_chat_sample-ubuntu-internvl2	3m 6s
visual_language_chat_sample-ubuntu-minicpm_v2_6	3m 30s
visual_language_chat_sample-ubuntu-llava_1_5 / visual_language_chat_sample-ubuntu-llava	3m 8s
visual_language_chat_sample-ubuntu-llava_next / visual_language_chat_sample-ubuntu-llava	3m 10s
ci/gha_overall_status_causal_lm	1s
	1h 33m 27s

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