[test] add a unit test for the LambdaHTTPServer Pool #540

Job	Run time
Semantic Version label check	3s
musl	1m 32s
Unit tests / Construct unit test matrix	5s
Integration Tests / Test Examples/APIGateway on	2m 5s
Integration Tests / Test Examples/APIGateway+LambdaAuthorizer on	2m 10s
Integration Tests / Test Examples/BackgroundTasks on	2m 2s
Integration Tests / Test Examples/HelloJSON on	1m 57s
Integration Tests / Test Examples/HelloWorld on	2m 4s
Integration Tests / Test Examples/ResourcesPackaging on	2m 0s
Integration Tests / Test Examples/S3EventNotifier on	2m 24s
Integration Tests / Test Examples/S3_AWSSDK on	5m 38s
Integration Tests / Test Examples/S3_Soto on	7m 44s
Integration Tests / Test Examples/Streaming on	1m 54s
Integration Tests / Test Examples/Testing on	2m 10s
Integration Tests / Test Examples/Tutorial on	1m 59s
Integration Tests / Test archive plugin (HelloWorld)	2m 52s
Integration Tests / Test archive plugin (ResourcesPackaging)	2m 40s
Integration Tests / No dependencies on Foundation	2m 1s
Swift 6 Language Mode / Swift 6 language mode	1m 19s
Soundness / Broken symlinks check	3s
Soundness / API breakage check	2m 31s
Soundness / Documentation check	1m 36s
Soundness / Format check	46s
Soundness / License headers check	10s
Soundness / Unacceptable language check	4s
Soundness / Python lint check	4s
Soundness / Shell check	36s
Soundness / YAML lint check	3s
Unit tests / Unit tests / Linux (6.0)	1m 26s
Unit tests / Unit tests / Linux (nightly-next)	1m 43s
Unit tests / Unit tests / Linux (nightly-main)	1m 40s
	55m 21s

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