[test] add a unit test for the LambdaHTTPServer Pool #606

Job	Run time
Semantic Version label check	5s
musl	1m 42s
Unit tests / Construct unit test matrix	6s
Soundness / Shell check	32s
Soundness / YAML lint check	4s
Soundness / Python lint check	9s
Soundness / Documentation check	1m 32s
Soundness / License headers check	6s
Soundness / Broken symlinks check	5s
Soundness / Unacceptable language check	6s
Soundness / API breakage check	2m 36s
Soundness / Format check	35s
Integration Tests / No dependencies on Foundation	1m 57s
Integration Tests / Test archive plugin (ResourcesPackaging)	2m 30s
Swift 6 Language Mode / Swift 6 language mode	1m 19s
Integration Tests / Test archive plugin (HelloWorld)	2m 48s
Integration Tests / Test Examples/APIGateway+LambdaAuthorizer on	1m 53s
Integration Tests / Test Examples/BackgroundTasks on	2m 25s
Integration Tests / Test Examples/HelloJSON on	1m 47s
Integration Tests / Test Examples/APIGateway on	2m 22s
Integration Tests / Test Examples/Testing on	2m 15s
Integration Tests / Test Examples/HelloWorld on	1m 46s
Integration Tests / Test Examples/Streaming on	1m 47s
Integration Tests / Test Examples/S3EventNotifier on	2m 24s
Integration Tests / Test Examples/Tutorial on	1m 49s
Integration Tests / Test Examples/ResourcesPackaging on	2m 3s
Integration Tests / Test Examples/S3_Soto on	8m 3s
Integration Tests / Test Examples/S3_AWSSDK on	6m 38s
Unit tests / Unit tests / Linux (6.0)	1m 29s
Unit tests / Unit tests / Linux (6.1)	1m 25s
Unit tests / Unit tests / Linux (nightly-next)	1m 52s
Unit tests / Unit tests / Linux (nightly-main)	1m 54s
	58m 4s

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