tests

feat: Reuse synthesized stream for TTS #4320

Job	Run time
base — macos-14) (py3.9)	3m 56s
base — macos-14) (py3.12)	2m 51s
base — windows-2019) (py3.9)	3m 50s
base — windows-2019) (py3.12)	10m 7s
base — ubuntu-20.04) (py3.9)	1m 57s
base — ubuntu-20.04) (py3.12)	2m 35s
base — namespace-profile-default-arm64) (py3.9)	2m 45s
base — namespace-profile-default-arm64) (py3.12)	2m 39s
llm — ubuntu-20.04) (py3.12)	4m 14s
stt — ubuntu-20.04) (py3.12)	9m 51s
tts — ubuntu-20.04) (py3.12)	3m 32s
	48m 17s

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