Simplified partial preemption algorithm. #1622

Job	Run time
cpp-greedy_causal_lm-windows	20m 56s
cpp-beam_search_causal_lm-ubuntu (./build/samples/cpp/beam_search_causal_lm/beam_search_causal_lm)	13m 6s
cpp-beam_search_causal_lm-ubuntu (python ./samples/python/beam_search_causal_lm/beam_search_causa...	11m 36s
cpp-beam_search_causal_lm-Qwen1_5-7B-Chat	7m 41s
cpp-beam_search_causal_lm-Phi-2	6m 14s
cpp-beam_search_causal_lm-notus-7b-v1	9m 1s
cpp-beam_search_causal_lm-Qwen-7B-Chat	10m 25s
cpp-greedy_causal_lm-redpajama-3b-chat	11m 5s
cpp-multinomial-greedy_causal_lm-ubuntu	7m 35s
cpp-Phi-1_5	7m 7s
cpp-prompt_lookup_decoding_lm-ubuntu	5m 47s
cpp-speculative_decoding_lm-ubuntu	9m 38s
cpp-chat_sample-ubuntu	9m 33s
cpp-continuous-batching-macos	10m 46s
cpp-continuous-batching-ubuntu	8m 53s
cpp-continuous-batching-windows	18m 55s
	2h 48m 18s

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