Remove dependency on XCTest #601

Job	Run time
Semantic Version label check	7s
musl	1m 37s
Unit tests / Construct unit test matrix	5s
Soundness / Broken symlinks check	3s
Soundness / Shell check	37s
Soundness / YAML lint check	6s
Soundness / License headers check	4s
Soundness / Python lint check	5s
Soundness / Format check	37s
Soundness / Documentation check	1m 40s
Soundness / API breakage check	2m 38s
Soundness / Unacceptable language check	6s
Integration Tests / Test Examples/APIGateway on	2m 5s
Integration Tests / Test Examples/S3_AWSSDK on	6m 39s
Integration Tests / Test Examples/BackgroundTasks on	2m 0s
Integration Tests / Test Examples/Streaming on	2m 2s
Integration Tests / Test Examples/ResourcesPackaging on	1m 59s
Integration Tests / Test Examples/APIGateway+LambdaAuthorizer on	2m 4s
Integration Tests / Test Examples/HelloJSON on	1m 58s
Integration Tests / Test Examples/HelloWorld on	1m 50s
Integration Tests / Test Examples/S3EventNotifier on	2m 47s
Integration Tests / Test Examples/S3_Soto on	8m 4s
Swift 6 Language Mode / Swift 6 language mode	1m 20s
Integration Tests / Test archive plugin (HelloWorld)	2m 41s
Integration Tests / Test Examples/Tutorial on	2m 1s
Integration Tests / Test archive plugin (ResourcesPackaging)	2m 46s
Integration Tests / No dependencies on Foundation	2m 21s
Integration Tests / Test Examples/Testing on	1m 59s
Unit tests / Unit tests / Linux (nightly-next)	2m 0s
Unit tests / Unit tests / Linux (6.1)	1m 32s
Unit tests / Unit tests / Linux (6.0)	1m 40s
Unit tests / Unit tests / Linux (nightly-main)	1m 58s
	59m 31s

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