migrate to swift-test #20

Job	Run time
License headers check	6s
Soundness / API breakage check	2m 29s
Soundness / Documentation check	37s
Soundness / Broken symlinks check	3s
Soundness / Format check	39s
Soundness / License headers check	0s
Soundness / Python lint check	0s
Soundness / Shell check	0s
Soundness / Unacceptable language check	3s
Soundness / YAML lint check	4s
Swift 6 Language Mode / Swift 6 language mode	1m 48s
Unit tests / Unit tests / Linux (5.9)	26s
Unit tests / Unit tests / Linux (5.10)	1m 30s
Unit tests / Unit tests / Linux (6.0)	2m 54s
Unit tests / Unit tests / Linux (nightly-6.0)	3m 46s
Unit tests / Unit tests / Linux (nightly-main)	3m 42s
	18m 7s

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