[core] Only one `LambdaRuntime.run()` can be called at a time (fix #507) #635

Job	Run time
Unit tests / Construct unit test matrix	3s
Semantic Version label check	7s
musl	1m 35s
Soundness / Unacceptable language check	3s
Soundness / API breakage check	1m 22s
Soundness / Documentation check	1m 22s
Soundness / License headers check	6s
Soundness / YAML lint check	4s
Soundness / Python lint check	7s
Soundness / Broken symlinks check	6s
Soundness / Format check	45s
Integration Tests / Test Examples/APIGateway+LambdaAuthorizer on	1m 13s
Integration Tests / Test Examples/ResourcesPackaging on	1m 16s
Integration Tests / Test Examples/S3_Soto on	1m 16s
Soundness / Shell check	37s
Integration Tests / Test Examples/APIGateway on	1m 12s
Integration Tests / Test Examples/BackgroundTasks on	1m 12s
Integration Tests / Test Examples/HelloJSON on	1m 12s
Integration Tests / Test Examples/Streaming on	1m 17s
Integration Tests / Test Examples/S3_AWSSDK on	1m 18s
Integration Tests / Test Examples/S3EventNotifier on	1m 16s
Integration Tests / Test Examples/HelloWorld on	1m 13s
Swift 6 Language Mode / Swift 6 language mode	1m 21s
Integration Tests / Test Examples/Testing on	1m 17s
Integration Tests / Test Examples/Tutorial on	1m 17s
Integration Tests / Test archive plugin (HelloWorld)	1m 26s
Integration Tests / Test archive plugin (ResourcesPackaging)	1m 29s
Integration Tests / No dependencies on Foundation	1m 25s
Unit tests / Unit tests / Linux (6.0)	1m 18s
Unit tests / Unit tests / Linux (6.1)	1m 17s
Unit tests / Unit tests / Linux (nightly-main)	1m 36s
Unit tests / Unit tests / Linux (nightly-next)	1m 36s
	32m 44s

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