Remove the concept of a GAE service endpoint #2869
                
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We don't need to support the mix of GAE and GKE any more so we can get rid of the GaeService bits and unify everything under one constant service. This also allows us to reduce the number of services down to four (FE, BE, PUBAPI, console) which is nice.
For now we still keep around BackendRequestComponent and FrontendRequestComponent -- they're only used by the test server, and we should probably eventually find another way to serve those in local testing.
This change is