fix: include add_special_tokens in kserve request #2072

Job	Run time
build (cuda) / build-and-push	7m 29s
build (cuda-trtllm) / build-and-push	1h 24m 12s
build (intel-cpu) / build-and-push	6m 12s
build (intel-xpu) / build-and-push	8m 40s
build (rocm) / build-and-push	7m 54s
build (intel-cpu) / integration_tests	3m 7s
build (cuda) / integration_tests	46m 17s
build (rocm) / integration_tests	1s
build (intel-xpu) / integration_tests	0s
build (cuda-trtllm) / integration_tests	0s
	2h 43m 52s

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