Make sure HttpManagerRequestAdded and HttpManagerRequestCompleted callback can be called on http thread.
From now on the delegates bind to http manager through SetRequestAddedDelegate and SetRequestCompletedDelegate have to be changed to be thread-safe.
#jira UE-182677
[REVIEW] [at]michael.atchison [at]michael.kirzinger [at]rafa.lecina [at]justin.marcus
[CL 27506980 by lorry li in ue5-main branch]
Move WebTests web server from Engine/Source/Programs/WebTests/WebServer to Engine/Source/Programs/WebTestsServer, so to make sure not include all files underneath into VS project.
[REVIEW] [at]michael.kirzinger [at]stephen.ma [at]chuck.zhu [at]michael.atchison [at]rafa.lecina
#jira UE-191978
#rb stephen.ma [at]rafa.lecina [at]michael.atchison
[CL 27189120 by lorry li in ue5-main branch]
