Allow disabling SwiftPM sandboxing #579

Job	Run time
Test / Windows (5.9 - windows-2022)	12m 8s
Test / Linux (5.8 - jammy)	4m 31s
Test / Windows (6.0 - windows-2022)	13m 4s
Test / Linux (5.9 - jammy)	4m 55s
Test / Windows (nightly-6.1 - windows-2022)	14m 42s
Test / Linux (5.10 - jammy)	4m 38s
Test / Linux (6.0 - jammy)	5m 53s
Soundness / API breakage check	0s
Soundness / Broken symlinks check	3s
Soundness / Documentation check	0s
Soundness / Format check	0s
Soundness / License headers check	0s
Soundness / Python lint check	7s
Soundness / Shell check	31s
Soundness / Unacceptable language check	2s
Soundness / YAML lint check	4s
	1h 0m 38s

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