Cherry-pick static LLM pipeline changes #1496

Job	Run time
cpp-beam_search_causal_lm-Phi-2	8m 11s
cpp-beam_search_causal_lm-notus-7b-v1	13m 7s
cpp-beam_search_causal_lm-Qwen1_5-7B-Chat	12m 51s
cpp-beam_search_causal_lm-Qwen-7B-Chat	14m 33s
cpp-beam_search_causal_lm-ubuntu (./build/samples/cpp/beam_search_causal_lm/beam_search_causal_lm)	11m 2s
cpp-chat_sample-ubuntu	9m 28s
cpp-continuous-batching-macos	17m 1s
cpp-beam_search_causal_lm-ubuntu (python ./samples/python/beam_search_causal_lm/beam_search_causa...	11m 16s
cpp-continuous-batching-ubuntu	11m 47s
cpp-continuous-batching-windows	20m 34s
cpp-greedy_causal_lm-redpajama-3b-chat	15m 22s
cpp-greedy_causal_lm-windows	20m 4s
cpp-multinomial-greedy_causal_lm-ubuntu	9m 43s
cpp-Phi-1_5	7m 13s
cpp-prompt_lookup_decoding_lm-ubuntu	6m 38s
cpp-speculative_decoding_lm-ubuntu	10m 40s
	3h 19m 30s

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