Override CB fleet with buildspec to setup and cleanup steps #131

Job	Run time
check-changes	1m 30s
set-test-environment	6s
build-sglang-image	-1s
sglang-sagemaker-endpoint-test	17s
sglang-local-benchmark-test	0s
sglang-frontend-test	0s
check-changes	1m 30s
sglang-sagemaker-endpoint-test	7m 21s
set-test-environment	6s
sglang-local-benchmark-test	-334s
sglang-frontend-test	-334s
build-sglang-image	-351s
	-370s

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