[core] Only one `LambdaRuntime.run()` can be called at a time (fix #507) #584

Job	Run time
musl	1m 36s
Semantic Version label check	4s
Unit tests / Construct unit test matrix	3s
Soundness / API breakage check	42s
Soundness / Documentation check	42s
Soundness / Unacceptable language check	5s
Soundness / License headers check	3s
Soundness / Broken symlinks check	5s
Soundness / Format check	38s
Soundness / Shell check	33s
Soundness / YAML lint check	4s
Soundness / Python lint check	5s
Integration Tests / Test Examples/APIGateway on	16s
Integration Tests / Test Examples/APIGateway+LambdaAuthorizer on	17s
Integration Tests / Test Examples/BackgroundTasks on	15s
Integration Tests / Test Examples/HelloJSON on	16s
Integration Tests / Test Examples/HelloWorld on	16s
Integration Tests / Test Examples/ResourcesPackaging on	16s
Integration Tests / Test Examples/S3EventNotifier on	16s
Integration Tests / Test Examples/S3_AWSSDK on	15s
Integration Tests / Test Examples/S3_Soto on	16s
Integration Tests / Test Examples/Streaming on	14s
Integration Tests / Test Examples/Testing on	15s
Integration Tests / Test Examples/Tutorial on	14s
Integration Tests / Test archive plugin (HelloWorld)	28s
Integration Tests / Test archive plugin (ResourcesPackaging)	28s
Integration Tests / No dependencies on Foundation	28s
Swift 6 Language Mode / Swift 6 language mode	43s
Unit tests / Unit tests / Linux (6.0)	1m 0s
Unit tests / Unit tests / Linux (nightly-next)	1m 0s
Unit tests / Unit tests / Linux (nightly-main)	59s
	12m 52s

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