Remove dependency on XCTest #599

Job	Run time
Semantic Version label check	6s
musl	1m 36s
Unit tests / Construct unit test matrix	5s
Swift 6 Language Mode / Swift 6 language mode	1m 21s
Soundness / Unacceptable language check	6s
Soundness / License headers check	4s
Soundness / Documentation check	1m 44s
Soundness / Broken symlinks check	4s
Soundness / Format check	36s
Integration Tests / Test Examples/ResourcesPackaging on	1m 45s
Integration Tests / Test Examples/HelloJSON on	1m 46s
Soundness / YAML lint check	4s
Soundness / Shell check	38s
Integration Tests / Test Examples/APIGateway on	2m 1s
Integration Tests / Test Examples/S3EventNotifier on	1m 54s
Integration Tests / Test Examples/S3_AWSSDK on	6m 22s
Integration Tests / Test Examples/APIGateway+LambdaAuthorizer on	2m 0s
Integration Tests / Test Examples/HelloWorld on	1m 46s
Soundness / Python lint check	7s
Integration Tests / Test Examples/S3_Soto on	7m 44s
Integration Tests / Test Examples/BackgroundTasks on	1m 47s
Integration Tests / Test Examples/Streaming on	1m 49s
Soundness / API breakage check	2m 41s
Integration Tests / Test Examples/Tutorial on	1m 55s
Integration Tests / Test Examples/Testing on	2m 2s
Integration Tests / Test archive plugin (ResourcesPackaging)	2m 31s
Integration Tests / Test archive plugin (HelloWorld)	2m 45s
Integration Tests / No dependencies on Foundation	2m 7s
Unit tests / Unit tests / Linux (nightly-next)	1m 54s
Unit tests / Unit tests / Linux (nightly-main)	2m 4s
Unit tests / Unit tests / Linux (6.0)	1m 28s
Unit tests / Unit tests / Linux (6.1)	1m 26s
	56m 18s

Provide feedback