feat: Reuse spinners to reduce visual noise #388

Job	Run time
Build	23s
Test	25s
Format	20s
Build binary (braintrust-setup-darwin-arm64)	32s
Build binary (braintrust-setup-linux-arm64)	30s
Lint	30s
Build binary (braintrust-setup-windows-arm64)	1m 54s
Build binary (braintrust-setup-darwin-x64)	1m 56s
Build binary (braintrust-setup-windows-x64)	53s
Build binary (braintrust-setup-linux-x64)	32s
	7m 55s

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