[test] add a unit test for the LambdaHTTPServer Pool #576

Job	Run time
musl	1m 57s
Semantic Version label check	4s
Unit tests / Construct unit test matrix	4s
Integration Tests / Test archive plugin (HelloWorld)	2m 31s
Integration Tests / Test Examples/APIGateway on	1m 53s
Integration Tests / Test archive plugin (ResourcesPackaging)	2m 44s
Integration Tests / Test Examples/APIGateway+LambdaAuthorizer on	2m 5s
Integration Tests / No dependencies on Foundation	2m 11s
Integration Tests / Test Examples/BackgroundTasks on	1m 49s
Integration Tests / Test Examples/HelloJSON on	1m 51s
Integration Tests / Test Examples/HelloWorld on	1m 51s
Soundness / API breakage check	2m 25s
Integration Tests / Test Examples/ResourcesPackaging on	1m 54s
Integration Tests / Test Examples/S3EventNotifier on	2m 3s
Soundness / Broken symlinks check	2s
Integration Tests / Test Examples/S3_AWSSDK on	5m 34s
Soundness / Documentation check	1m 44s
Soundness / Format check	37s
Integration Tests / Test Examples/S3_Soto on	7m 47s
Soundness / License headers check	3s
Integration Tests / Test Examples/Streaming on	2m 1s
Soundness / Unacceptable language check	3s
Soundness / Python lint check	6s
Integration Tests / Test Examples/Testing on	2m 3s
Soundness / Shell check	36s
Integration Tests / Test Examples/Tutorial on	1m 57s
Soundness / YAML lint check	3s
Swift 6 Language Mode / Swift 6 language mode	1m 25s
Unit tests / Unit tests / Linux (6.0)	1m 33s
Unit tests / Unit tests / Linux (nightly-next)	1m 46s
Unit tests / Unit tests / Linux (nightly-main)	1m 58s
	54m 40s

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