Support two sorobans for preflight #1097

Job	Run time
Build (ubuntu-latest, x86_64-unknown-linux-gnu, amd64)	3m 13s
Build (ubuntu-latest, x86_64-unknown-linux-gnu, amd64)	3m 13s
Build (ubuntu-latest, aarch64-unknown-linux-gnu, arm64)	3m 56s
Build (ubuntu-latest, aarch64-unknown-linux-gnu, arm64)	3m 56s
Integration tests (ubuntu-20.04, 21)	6m 25s
Integration tests (ubuntu-20.04, 21)	8m 16s
Build (macos-latest, x86_64-apple-darwin, amd64)	6m 23s
Build (macos-latest, x86_64-apple-darwin, amd64)	6m 23s
Integration tests (ubuntu-20.04, 22)	3m 55s
Integration tests (ubuntu-20.04, 22)	3m 55s
Unit tests (ubuntu-20.04)	3m 13s
Unit tests (ubuntu-20.04)	3m 13s
Build (macos-latest, aarch64-apple-darwin, arm64)	7m 21s
Build (macos-latest, aarch64-apple-darwin, arm64)	7m 21s
Integration tests (ubuntu-22.04, 21)	7m 4s
Integration tests (ubuntu-22.04, 21)	6m 7s
Unit tests (ubuntu-22.04)	3m 18s
Unit tests (ubuntu-22.04)	3m 18s
Build (windows-latest, x86_64-pc-windows-gnu, amd64)	12m 38s
Build (windows-latest, x86_64-pc-windows-gnu, amd64)	12m 38s
Integration tests (ubuntu-22.04, 22)	3m 55s
Integration tests (ubuntu-22.04, 22)	3m 55s
	2h 3m 36s

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