[test] add a unit test for the LambdaHTTPServer Pool #541

Job	Run time
Semantic Version label check	4s
musl	1m 33s
Unit tests / Construct unit test matrix	6s
Integration Tests / No dependencies on Foundation	2m 13s
Integration Tests / Test archive plugin (HelloWorld)	2m 20s
Integration Tests / Test Examples/APIGateway on	1m 48s
Integration Tests / Test archive plugin (ResourcesPackaging)	2m 49s
Integration Tests / Test Examples/APIGateway+LambdaAuthorizer on	1m 58s
Soundness / API breakage check	2m 30s
Integration Tests / Test Examples/BackgroundTasks on	1m 43s
Integration Tests / Test Examples/HelloJSON on	1m 43s
Soundness / Documentation check	1m 35s
Integration Tests / Test Examples/HelloWorld on	1m 46s
Soundness / Unacceptable language check	6s
Integration Tests / Test Examples/ResourcesPackaging on	1m 45s
Soundness / Broken symlinks check	2s
Soundness / Format check	34s
Integration Tests / Test Examples/S3EventNotifier on	2m 2s
Soundness / License headers check	3s
Integration Tests / Test Examples/S3_AWSSDK on	5m 14s
Integration Tests / Test Examples/S3_Soto on	7m 17s
Soundness / Shell check	32s
Soundness / Python lint check	5s
Integration Tests / Test Examples/Streaming on	1m 44s
Soundness / YAML lint check	3s
Integration Tests / Test Examples/Testing on	1m 56s
Swift 6 Language Mode / Swift 6 language mode	1m 19s
Integration Tests / Test Examples/Tutorial on	1m 42s
Unit tests / Unit tests / Linux (6.0)	1m 30s
Unit tests / Unit tests / Linux (nightly-next)	1m 44s
Unit tests / Unit tests / Linux (nightly-main)	1m 47s
	51m 33s

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