Investigate Edge extension ownership of networking related integration testing

[timkimadobe]

Task description

Need to investigate the use cases across extensions that depend on Edge Network extension, and see if it is sufficient for Edge Network extension to own all networking related integration testing cases. That is, the ones dealing with NetworkRequest and HttpConnection

Additional implementation details or code snippet(s)

No response

[timkimadobe]

Complete investigation findings in wiki - overall conclusion is that other extensions are currently only using mock networking, or if they use real networking they only need the event responses which are already processed by Edge (that is, the real networking status code checks etc. can be owned by Edge)