Skip setup process for icu4c if we don't have bullet_train-conversations #999

Job	Run time
🔎 DB Schema / check	36s
🔬 Standardrb / lint	13s
🧪 Minitest / 🧮 Calculate Dynamic Matrix	4s
🧪 Minitest / 🧪 (1,2,3,4)	2m 26s
🧪 Minitest / 🧪 (5,6,7,8)	1m 58s
🧪 Minitest / 🧪 (9,10,11,12)	1m 47s
🧪 Minitest / 🧪 (13,14,15,16)	1m 28s
♻️ SimpleCov / ♻️	15s
🪵 Combine Runtime Logs / 🪵	17s
📊 Test Results / 📊	4s
	9m 8s

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