Move tests on sampling to test_sampling.py #6314

Job	Run time
cpp-greedy_causal_lm-windows	26m 57s
cpp-multinomial-greedy_causal_lm-ubuntu	17m 51s
cpp-beam_search_causal_lm-Phi-2	16m 9s
cpp-beam_search_causal_lm-notus-7b-v1	31m 16s
cpp-beam_search_causal_lm-Qwen1_5-7B-Chat	33m 9s
cpp-beam_search_causal_lm-ubuntu (./build/samples/cpp/beam_search_causal_lm/beam_search_causal_lm)	18m 46s
cpp-beam_search_causal_lm-ubuntu (python ./samples/python/beam_search_causal_lm/beam_search_causa...	17m 16s
cpp-chat_sample-ubuntu	16m 11s
cpp-greedy_causal_lm-Qwen-7B-Chat	11m 7s
cpp-greedy_causal_lm-redpajama-3b-chat	11m 27s
cpp-Phi-1_5	8m 40s
cpp-prompt_lookup_decoding_lm-ubuntu	9m 20s
cpp-speculative_decoding_lm-ubuntu	12m 31s
cpp-continuous-batching-macos	18m 41s
cpp-continuous-batching-ubuntu	13m 21s
cpp-continuous-batching-windows	25m 7s
visual_language_chat_sample-ubuntu-internvl2	23m 0s
visual_language_chat_sample-ubuntu-minicpm_v2_6	7m 6s
visual_language_chat_sample-ubuntu-llava_1_5 / visual_language_chat_sample-ubuntu-llava	13m 45s
visual_language_chat_sample-ubuntu-llava_next / visual_language_chat_sample-ubuntu-llava	18m 9s
ci/gha_overall_status_causal_lm	1s
	5h 49m 50s

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