migrate to swift-test (#9) #21

Job	Run time
License headers check	4s
Soundness / Documentation check	39s
Soundness / Broken symlinks check	6s
Soundness / Format check	39s
Soundness / API breakage check	2m 33s
Soundness / License headers check	0s
Soundness / Python lint check	0s
Soundness / Shell check	0s
Soundness / Unacceptable language check	3s
Swift 6 Language Mode / Swift 6 language mode	1m 46s
Soundness / YAML lint check	3s
Unit tests / Unit tests / Linux (5.9)	26s
Unit tests / Unit tests / Linux (5.10)	1m 28s
Unit tests / Unit tests / Linux (6.0)	2m 57s
Unit tests / Unit tests / Linux (nightly-6.0)	3m 45s
Unit tests / Unit tests / Linux (nightly-main)	3m 41s
	18m 10s

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